La Buche De Noel Recipes

BUCHE DE NOEL

Steps:

• Make chocolate genoise and mousse, ganache icing, and meringue mushrooms.
• To assemble cake, carefully unroll genoise on the back side of a baking sheet (discard the plastic wrap and waxed paper, but keep the towel). Spread chocolate mousse evenly on cake to within 1 to 2 inches of one long end. Reroll cake, starting from other long end, using towel to help roll it. Cover with plastic wrap; chill until firm, about 1 hour.
• Place cake, seam side down, on a serving platter; tuck parchment around it to keep platter clean while decorating.
• Whip ganache at medium speed until it has the consistency of soft butter. Cut two wedges off ends of cake at a 45-degree angle; set aside. Ice log with a thin layer of ganache. Attach wedges on diagonally opposite sides of log. Spread ganache all over log, using a small spatula to form barklike ridges. Chill until ganache is firm, about 30 minutes.
• In the top of a double boiler or in a heatproof bowl set over simmering water, melt chocolate until smooth. Line a baking sheet with parchment. Spread melted chocolate 1/8 inch thick over parchment. Refrigerate until cold, 10 to 15 minutes. Roll paper back and forth until chocolate splinters; sprinkle over cake. Chill cake until ready to serve.
• When ready to serve, arrange meringue mushrooms around and on cake, and dust lightly with confectioners' sugar.

ALLRECIPES FLOURLESS CHOCOLATE CAKE

Steps:

• Heat oven to 350° F. Butter a 9-inch springform pan and dust with cocoa powder.
• In a medium saucepan, heat the butter with ¼ cup of the heavy cream over medium-low heat until the butter is melted. Add the chocolate and stir until melted and smooth; remove from heat.
• In a medium bowl, whisk together the eggs, granulated sugar, and cocoa powder. Whisk in the chocolate mixture.
• Transfer the batter to the prepared pan and bake until puffed and set, 35 to 40 minutes. Let cool in the pan for 1 hour. Run a knife around the edge of the cake before unmolding.
• Using an electric mixer, beat the remaining 1 cup of heavy cream with the crème fraîche and confectioners' sugar until soft peaks form. Dust the cake with cocoa (or confectioners' sugar) and serve with the whipped cream mixture.

BUCHE DE NOEL

Steps:

• Preheat oven to 375 degrees F (190 degrees C). Line a 10x15 inch jellyroll pan with parchment paper. In a large bowl, whip cream, 1/2 cup confectioners' sugar, 1/2 cup cocoa, and 1 teaspoon vanilla until thick and stiff. Refrigerate.
• In a large bowl, use an electric mixer to beat egg yolks with 1/2 cup sugar until thick and pale. Blend in 1/3 cup cocoa, 1 1/2 teaspoons vanilla, and salt. In large glass bowl, using clean beaters, whip egg whites to soft peaks. Gradually add 1/4 cup sugar, and beat until whites form stiff peaks. Immediately fold the yolk mixture into the whites. Spread the batter evenly into the prepared pan.
• Bake for 12 to 15 minutes in the preheated oven, or until the cake springs back when lightly touched. Dust a clean dishtowel with confectioners' sugar. Run a knife around the edge of the pan, and turn the warm cake out onto the towel. Remove and discard parchment paper. Starting at the short edge of the cake, roll the cake up with the towel. Cool for 30 minutes.
• Unroll the cake, and spread the filling to within 1 inch of the edge. Roll the cake up with the filling inside. Place seam side down onto a serving plate, and refrigerate until serving. Dust with confectioners' sugar before serving.

BUCHE DE NOEL

Steps:

• PREPARE THE BISCUIT: Preheat oven to 420 degrees F. Place the whole eggs and yolks in a medium-sized mixing bowl. Add 1/3 cup of the granulated sugar and the milk. Whip with an electric mixer on medium-high speed, until the mixture lightens in color and triples in volume, about 6 minutes. Place the egg whites in a large mixing bowl, and whip at medium speed until foamy. Make French meringue by adding the remaining 2 tablespoons granulated sugar, 1 tablespoon at a time. When all the sugar has been added, increase mixer speed to medium-high and whip to stiff but not dry peaks, about 5 minutes.
• Use a rubber spatula to fold the egg mixture in batches into the meringue, incorporating it gradually so as not to deflate the meringue. When all the yolk mixture has been incorporated, place the flour in a fine-mesh sieve and sift over the mixture. Gently fold this in with the rubber spatula. Spread the batter evenly on a parchment-covered baking sheet, liberally dust the top of the biscuit with powdered sugar and place in the oven. Bake just until biscuit begins to brown on top, about 5 minutes. This will lock in the moisture, allowing you to roll the cake later without cracking it. Immediately after removing from the oven, run a knife around the inside of the baking sheet to loosen the cake from the sides. Remove cake from baking sheet and allow it to cool.
• PREPARE CHOCOLATE PASTRY CREAM: Make pastry cream as directed and let cool. Melt the chocolate in a double boiler or a mixing bowl placed over a bowl of simmering water, stirring it occasionally as it melts. When all of the chocolate is melted and smooth, remove it from heat, and add the cold pastry cream to the warm chocolate. Mix them together with a rubber spatula.
• PREPARE THE ROULADE: Place the biscuit on your work surface and soak with the flavored syrup. Spread the chocolate pastry cream evenly over the cake, spreading it all the way to the edges. Start at one long end and, rolling toward you, roll it into a tight cylinder. Place the roulade on a parchment covered baking sheet and place in the refrigerator for a few hours to set.
• PREPARE THE MUSHROOMS: Preheat oven to 250 degrees. Whip the egg whites on medium speed until foamy. Add the granulated sugar 1 tablespoon at a time, until you have volume, then add the rest of the sugar. Increase mixer speed to medium-high and whip until you have stiff but not dry peaks. Gently fold in the powdered sugar. Place the meringue in a large pastry bag fitted with a 1/4-inch plain tip. Pipe the mushroom pieces onto a parchment covered baking sheet. Make the stems by squeezing out a dime-sized mound of meringue, then pull the pastry bag straight up, leaving a small tail. Make the caps by piping 1/2-inch mounds onto the sheet. Sprinkle the caps with a little cocoa powder and place in the oven. Bake until firm and dry, about 1 hour, leaving the oven door cracked so moisture can escape. Remove from the oven and cool on a rack.
• PREPARE CHOCOLATE TREES: Make a cornet from parchment paper and fill half full with tempered chocolate. Pipe a long thick chocolate raindrop on a sheet of parchment paper. Draw a cake comb through the chocolate, starting at the center of the raindrop and moving from left to right. Repeat, starting at the center and moving from right to left. You should have a chocolate pine tree. Repeat for as many trees as you want. Allow the chocolate to set before peeling the parchment paper from it.
• PREPARE THE CHOCOLATE FENCE: Fill a cornet half full with the tempered chocolate, and pipe a 3 to 4-inch long railroad track, with the outside rails spaced about 2 inches apart and the inside rails spaced about 1/2-inch apart onto a sheet of parchment paper. Allow the chocolate to set before peeling the parchment paper from it.
• PREPARE THE COFFEE BUTTERCREAM: Place the egg yolks and whole egg in a large mixing bowl, and whip until thick, light, and tripled in volume, 5 to 7 minutes. Pour the water and granulated sugar into a 1-quart heavy-bottomed saucepan and place over medium heat. Insert a candy thermometer into the mixture. The sugar is ready when it reaches 250 degrees, or the soft ball stage. Pour the cooked sugar down the side of the bowl into the whipping eggs. Continue whipping the mixture until the outside of the bowl is warm but not hot, about 2 or 3 minutes. Add the butter all at once, and beat on medium speed until incorporated. Now whip on medium-high speed until thick, smooth and shiny, about 10 minutes. Remove about 1/3 cup and set aside. Add the coffee extract to the remaining buttercream and whip until well combined.
• ASSEMBLE THE BUCHE: Place the rolled cake on the platter you will use to serve it. Use a sharp knife to slice a 11/2-inch-thick slice from each end of the roll. These will become gnarls on the log. Spread a thick layer of buttercream over the buche. Place the ends or gnarls on top of the log, 1 at each end and cover with buttercream. Run a cake comb through the buttercream along the length of the buche, to make it look like bark. Place the buche in the refrigerator for about 15 minutes to let the buttercream set.
• MAKE THE IVY AND FLOWERS: Divide the unflavored buttercream evenly among 3 bowls and color each with 1 of the food colorings. Make 3 cornets from triangles of parchment paper, and fill one with pink buttercream, one with green, and one with yellow. Remove the buche from the refrigerator. Use the green icing cornet to make the ivy, by piping long curved lines along the length of the buche.
• Place small yellow dots along this stem, for the flower centers. Surround these with pink dots for the flower petals. Cut the tip of the cornet diagonally to make a point and fill it with green icing. Squeeze a dab of green buttercream out of the corner of each leaf.
• FINISHING THE BUCHE: Stick together the caps and ends of the mushrooms, using a dab of buttercream. Place the mushrooms, chocolate trees and chocolate fence on the buche. Dust the buche with powdered sugar and sprinkle with chocolate shavings. Refrigerate for 1 hour,then serve and enjoy!
• Sift together the cornstarch and half the sugar in a medium bowl, add the egg yolks and whisk until well combined. Pour the milk and remaining sugar into a 2-quart nonreactive heavy-bottomed saucepan and place over medium-high heat. While milk is heating, slice the vanilla bean in half lengthwise. Separate the seeds, and add both seeds and skin to the milk. Bring it to a boil. Carefully pour about half of the milk into the egg mixture, whisking so eggs don't scramble. Pour this mixture back into the saucepan and continue to whisk, as pastry cream thickens. Bring to a boil and continue to whisk and cook for 2 minutes more. Remove from heat, strain through a fine-mesh sieve, and add butter in small chunks if desired. Stir butter into cream until well incorporated. Pour pastry cream into an airtight container and put plastic wrap on top to prevent a skin from forming. Store in refrigerator for up to 3 days, until ready to use.
• SIMPLE SYRUP: Water, scant 1 1/4 cups Granulated sugar, 2/3 cup Liqueur, 2 1/2 tablespoons
• Place the water and sugar in a heavy saucepan over medium-high heat and bring to a boil, stirring occasionally. The sugar should completely dissolve. Remove from heat and pour into a mixing bowl. Cool before adding the liqueur.
• TEMPERED CHOCOLATE: When you melt chocolate, the molecules of fat separate. To put them back together, you temper it. One way to temper is to place the chocolate in the microwave, and microwave it on high power for 30 seconds at a time until the chocolate is melted. As it recrystallizes, it becomes tempered.

BUCHE DE NOEL

Steps:

• To make the buttercream: Whisk the egg whites and sugar together in the bowl of an electric mixer. Set the bowl over simmering water and whisk gently until the sugar is dissolved and the egg whites are hot. Attach the bowl to the mixer and whip with the whisk on medium speed until cooled. Switch to the paddle and beat in the softened butter and continue beating until the buttercream is smooth. Dissolve the instant coffee in the liquor and beat into the buttercream.
• Turn the genoise layer over and peel away the paper. Invert onto a fresh piece of paper. Spread the layer with half the buttercream. Use the paper to help you roll the cake into a tight cylinder Transfer to baking sheet and refrigerate for at least 30 minutes or until set. Reserve the remaining buttercream for the outside of the buche.
• To make the marzipan: Combine the almond paste and 1 cup of the sugar in the bowl of the electric mixer and beat with the paddle attachment on low speed until the sugar is almost absorbed. Add the remaining 1 cup sugar and mix until the mixture resembles fine crumbs. Add half the corn syrup, then continue mixing until a bit of the marzipan holds together when squeezed, adding additional corn syrup a little at a time, as necessary; the marzipan in the bowl will still appear crumbly. Transfer the marzipan to a work surface and knead until smooth.
• To make marzipan mushrooms: Roll 1/3 of the marzipan into a 6-inch long cylinder and cut into 1-inch lengths. Roll half the lengths into balls. Press the remaining cylindrical lengths (stems) into the balls (caps) to make mushrooms. Smudge with cocoa powder. To make holly leaves: Knead green color into 1/2 the remaining marzipan and roll it into a long cylinder. Flatten with the back of a spoon, then loosen it from the surface with a spatula. Cut into diamonds to make leaves, or use a cutter.
• To make holly berries: Knead red color into a tiny piece of marzipan. Roll into tiny balls.
• To make pine cones, knead cocoa powder into the remaining marzipan. Divide in half and form into 2 cone shapes. Slash the sides of cones with the points of a pair of scissors.
• Unwrap the cake. Trim the ends on the diagonal, starting the cuts about 2 inches away from each end. Position the larger cut piece on the buche about 2/3 across the top. Cover the buche with the reserved buttercream, making sure to curve around the protruding stump. Streak the buttercream with a fork or decorating comb to resemble bark. Transfer the buche to a platter and decorate with the marzipan. Sprinkle the platter and buche sparingly with confectioners' sugar "snow."
• Storage: Keep at cool room temperature. Cover leftovers loosely and keep at room temperature.
• Set rack in the middle of the oven and preheat to 400 degrees.
• Half-fill a medium saucepan with water and bring it to a boil over high heat. Lower the heat so the water is simmering.
• Whisk the eggs, yolks, salt, and sugar together in the bowl of a heavy-duty mixer. Place over the pan of simmering water and whisk gently until the mixture is just lukewarm, about 100 degrees (test with your finger). Attach the bowl to the mixer and with the whisk attachment, whip on medium-high speed until the egg mixture is cooled (touch the outside of the bowl to tell) and tripled in volume.
• While the eggs are whipping, stir together the flour, cornstarch, and cocoa.
• Sift 1/3 of the flour mixture over the beaten eggs. Use a rubber spatula to fold in the flour mixture, making sure to scrape all the way to the bottom of the bowl on every pass through the batter to prevent the flour mixture from accumulating there and making lumps. Repeat with another 1/3 of the flour mixture and finally with the remainder.
• Scrape the batter into the prepared pan and smooth the top. Bake the genoise for about 10 to 12 minutes, or until well risen, deep and firm to the touch. (Make sure the cake doesn't overbake and become too dry, or it will be hard to roll.)
• Use a small paring knife to loosen the cake from the sides of the pan. Invert the cake onto a rack and let the cake cool right side up on the paper. Remove the paper when the cake is cool.
• Storage: Wrap in plastic wrap and refrigerate for several days, or double-wrap and freeze for up to a month.

BUCHE DE NOEL

Steps:

• Preheat oven to 400 degrees. Lightly grease a 12-by-15-inch sheetcake or jelly-roll pan and line it with aluminum foil or baking parchment, leaving an overhang of about an inch on each end. Grease and lightly flour the foil or paper.
• Toast hazelnuts in oven until they turn dark brown, about 7 minutes. If nuts are unblanched rub in a towel to remove skin. Let nuts cool; then grind until fine in a processor with 1/4 cup sugar.
• In bowl of an electric mixer, beat 6 egg yolks with remaining 1/3 cup sugar until pale and stiff, about 5 minutes.
• In a clean, dry copper bowl or the bowl of an electric mixer - or using a hand-held electric beater -whip 7 egg whites slowly until they start to foam. Increase speed to medium. When they are opaque white, add salt and beat at medium speed until stiff white peaks form, about 3 minutes.
• Alternately fold the sifted flour, nuts and half the whites into yolks. The batter will be thick. When all components are incorporated, fold in remaining whites. Remove 1 cup of the mixture and stir the melted butter into it. Fold into the batter.
• Spread batter on prepared sheetcake or jelly-roll pan with a spatula, spreading evenly to corners and along sides; try not to deflate batter. Bake 5 to 6 minutes, until cake just springs back when pressed. It is better to underbake it slightly.
• Remove cake from pan using the overhanging piece of foil or paper. Set on a counter or rack. Turn over onto another baking sheet and carefully peel off foil or paper. Turn over again onto a clean sheet of foil, and cover with towel. With an electric mixer whip the yolks at medium speed until pale, thick and creamy, about 5 minutes.
• In a small saucepan, stir together sugar and water. Boil until you can form a soft ball with a bit of syrup dropped from a spoon into a bowl of cold water; it should register 242 degrees on a candy thermometer. This takes 3 to 4 minutes after the syrup comes to a boil. With mixer running, slowly pour the syrup in a thin stream into the center of the yolks. Beat at slow to medium speed until mixture is cool, about 10 minutes.
• With mixer still running, slowly add the softened butter to the yolks and beat at low speed until completely smooth, about 5 minutes. If even after 5 minutes the cream still has small lumps, remove about a half-cup to a bowl and beat it over hot water until it is smooth; return to the mixer bowl and all of the cream should become smooth, with the consistency of creamed butter. (You can repeat this process several times.) Increase speed to medium and continue beating 10 minutes, until butter cream billows like whipped cream and shows large air holes when a spoon is run through it.
• Beat in dissolved coffee.
• To assemble buche, use a spatula to spread butter cream over the cake. The cream layer should be less than 1/4 inch thick. Crumble all but 3 marrons glaces over the butter cream. Using the foil as a support, roll up the cake by the long end to form a log shape. Trim ends.
• To decorate, place a ruler over length of the log and sift confectioners' sugar over log. Remove ruler and arrange slices of reserved marrons glaces down the length. Transfer to a serving platter. Buche is best left at room temperature and served within 3 to 4 hours, but it can be refrigerated for a day.

BûCHE DE NOëL (A FRENCH CHRISTMAS DESSERT) RECIPE BY TASTY

Steps:

• Make the chocolate sponge cake: Preheat the oven to 350°F (180°C). Grease a roll cake baking pan or 18 x 13-inch (45 x 33 cm) baking sheet with nonstick spray and line with parchment paper.
• In a large bowl, whisk together the egg yolks and 3 tablespoons of sugar until the sugar is dissolved.
• Whisk in the milk, vegetable oil, and vanilla until smooth. Sift in the flour, cocoa powder, and cornstarch and whisk until smooth.
• In a large bowl with an electric hand mixer, or the bowl of a stand mixer fitted with the whisk attachment, whip the egg whites on medium speed until frothy, about 2 minutes. Add the cream of tartar and whip on medium-low speed for 2 minutes, then gradually add the remaining ½ cup (100 G) superfine sugar. Whip on medium-high speed until stiff peaks form, another 2-3 minutes.
• Fold the egg white mixture into the egg yolk mixture until just combined, taking care not to overmix.
• Spread the batter evenly on the prepared pan. Bake for 12-15 minutes, until fluffy and the cake springs back when gently pressed.
• Drape a kitchen towel over the cake and set a wire rack on top. Carefully invert the cake onto the rack, peel back the parchment from the bottom, and let cool for 10 minutes. Carefully roll the cake into a log with the towel inside and allow to cool completely.
• While the cake cools, make the chocolate hazelnut buttercream: In a large bowl, beat the butter and powdered sugar with an electric hand mixer on low speed until combined. Increase the speed to high and whip for 2-3 minutes, until light and fluffy.
• Reduce the speed to low and add the milk, vanilla, and salt. Whip again for 2-3 minutes until well incorporated and the buttercream is light, bright white, and fluffy.
• Fold in the chocolate-hazelnut spread with a rubber spatula. Cover with a kitchen towel or place wrap and set aside at room temperature.
• Make the ganache: Place the chopped chocolate in a medium bowl. Pour the hot cream over the chocolate. Stir until the chocolate is melted. Refrigerate the ganache for at least 30 minutes to firm.
• Make the meringue mushrooms: Reduce the oven temperature to 200°F (93°C). Line a baking sheet with parchment paper.
• In a medium bowl, beat the egg whites and cream of tartar with an electric hand mixer until soft peaks form, about 3 minutes.
• Gradually add the sugar and whip until dissolved and stiff peaks form, about 2 minutes more. The mixture should be glossy, shiny, and very stiff.
• Transfer the mixture to a piping bag fitted with a medium round tip. Pipe half of the meringue onto the prepared baking sheet in ½-1 inch (2.54 cm) wide circles resembling mushroom caps. Use your fingers to gently press down any peaks. Pipe the remaining meringue into ½-1 inch (2.54 cm) long stems. Dust the mushrooms with cocoa powder.
• Bake for 1½-2 hours, until the mushrooms are completely dried and hard to the touch. Turn off the oven and leave the mushrooms dry out in the oven for at least 30 minutes, or up to overnight. The mushrooms can be made 1-2 days ahead.
• Assemble the mushrooms: Dip the flat sides of the mushroom caps in the melted chocolate and attach the mushroom stems. Stand the mushrooms upright and let dry, 30-45 minutes.
• Make the sugared cranberries and rosemary: Line a baking sheet with parchment paper and top with a wire rack.
• In a small saucepan, combine 1 cup (200 G) sugar and the water. Bring to a boil, whisking to dissolve the sugar. Drop the cranberries into the syrup and stir to coat, then remove with a slotted spoon and transfer to one side of the wire rack. Let cool for at least 1 hour, until no longer sticky, then sprinkle cranberries with ¼ cup (25 G) sugar. Set aside.
• Bring the remaining syrup to a boil. Add the rosemary sprigs and stir to coat, then remove with a slotted spoon and transfer to the other side of the wire rack. Let cool for at least 1 hour, then sprinkle rosemary with the remaining ¼ cup (25 G) sugar. Set aside.
• Assemble the bûche de noël: Unroll the sponge cake.
• Spread 2 cups (230 G) of the chocolate-hazelnut buttercream. evenly over the cake, leaving a 1-inch (2.54 cm) border around all sides.
• Starting from one end, using the towel to help guide the rolling, roll the cake into a tight spiral. Place the cake, seam-side down, in the refrigerator to set, at least 30 minutes, or up to overnight.
• Unwrap the cake log from the towel and set on a serving platter.
• Remove the ganache from the fridge and transfer to a piping bag fitted with a medium star tip.
• Trim 2½ inches (6 cm) ( off one end of the cake log and attach to the center of the log with 2 tablespoons of the ganache to resemble a stump.
• Cover the entire log, starting at one end and piping lengthwise, with ganache.
• Arrange the sugared rosemary and cranberries and meringue mushrooms around the log. Dust with powdered sugar to resemble snow.
• The cake will keep in the refrigerator, covered, for up to 3 days.
• Slice and serve.
• Enjoy!

BûCHE DE NOëL

Steps:

• Heat oven to 220C/200C fan /gas 7. Line a 23 x 33cm Swiss roll tin with baking parchment and oil lightly. Whisk the caster sugar and yolks in a bowl until pale and thick. Melt the chocolate with 4 tbsp cold water in a bowl set over a pan of simmering water. Stir in the sugar mix.
• Whisk egg whites to stiff peaks. Stir a spoonful into the chocolate, then fold in remaining using a large metal spoon. Pour batter into tin and bake for 12-14 mins until risen and just firm. Leave in tin until cold.
• Lay a sheet of baking parchment on a board. With one bold movement, turn the cake onto the paper, then lift off the tin. Carefully peel away the lining paper.
• Spread the whipped cream all over the cake, then scatter over the berries with a dribble of Drambuie, if you like. Starting at the long side opposite you, use the paper to roll the cake towards you. Transfer to a serving dish.
• For the buttercream, beat the butter, then sift in sugar and cocoa. Add milk and mix together. Spread over cake, use a fork to create a log effect, and chill until needed. Decorate, dust with icing sugar and serve.

BUCHE DE NOEL (YULE LOG)

Steps:

• Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13-inch jelly roll pan with 1 teaspoon butter and line with parchment paper. Grease parchment paper with 1 teaspoon butter.
• Whisk flour, cocoa powder, and salt together in a small bowl.
• Combine egg yolks, 1/4 cup confectioners' sugar, and vanilla extract in a bowl; beat with an electric mixer on medium-high speed until pale yellow, 3 to 4 minutes.
• Clean the beaters of the electric mixer. Beat egg whites in a bowl on medium-high speed until foamy, 1 to 2 minutes. Gradually add 1/2 cup confectioners' sugar and beat until stiff peaks form, 2 to 3 minutes more.
• Fold egg yolk mixture gently into the egg whites. Fold flour mixture in gradually until batter is smooth.
• Pour batter into the prepared jelly roll pan and spread evenly with an offset spatula.
• Bake in the preheated oven until a toothpick inserted into the center comes out clean, 8 to 10 minutes. Let cool, about 30 minutes.
• Combine 1 cup heavy cream, 3 tablespoons confectioners' sugar, and sour cream in a bowl; blend with an electric mixer on medium-high speed until stiff, 1 to 2 minutes.
• Turn the jelly roll pan so the shorter side faces you. Spread whipped cream over the cake, leaving a 2-inch border at the top. Roll up cake toward the uncovered border, letting the parchment paper fall away as you roll. Place roll seam-side down on a serving platter.
• Place 1/2 cup heavy cream in a small saucepan over medium-low heat until warmed through, 3 to 5 minutes. Remove from heat and stir in chocolate chips. Let stand until chocolate softens, about 3 minutes. Stir with a spatula or wooden spoon until ganache is smooth and creamy.
• Drizzle chocolate ganache over rolled cake. Let stand until set, about 5 minutes. Run a fork through the ganache to create a tree bark effect.

BûCHE DE NOëL

Steps:

• Mushrooms and buttercream:
• Preheat oven to 225°F. Whisk egg whites, sugar, cream of tartar, and salt in a large heatproof bowl set over a medium saucepan of simmering water (bowl should not touch water) until egg whites are very liquid (mixture will be warm to the touch) and sugar is dissolved (rub between your fingers to check), about 5 minutes. Remove bowl from heat and beat with an electric mixer until stiff, glossy peaks form (bowl will feel cool), about 5 minutes.
• Line a rimmed baking sheet with parchment paper and dust very lightly with cocoa powder. Scoop out 1 cup meringue. Dollop heaping teaspoonfuls of meringue onto prepared baking sheet, spacing at least 1 1/2" apart.
• Lightly dust meringue with more cocoa powder and place a sheet of parchment over top. Use an offset spatula or your hands to flatten meringue into irregularly shaped disks about 1/8" thick. Bake until lightly browned and parchment peels away easily, 75-90 minutes (meringue will be soft when it first comes out of the oven but will dry and crisp as it cools).
• Meanwhile, with mixer on medium speed, beat butter into remaining meringue, adding a piece at a time and waiting until incorporated before adding more. Beat until mixture is very smooth. (If it looks very loose or curdled, just keep beating; buttercream will come back together.) Add vanilla extract and scrape in vanilla seeds; beat to combine.
• Do Ahead
• Mushrooms and buttercream can be made 2 days ahead. Store mushrooms airtight at room temperature. Cover and chill buttercream; bring to room temperature, then beat until smooth before using.
• Sponge Cake:
• Increase oven to 400°F. Coat a 26x18" rimmed baking sheet with nonstick spray and line with parchment paper, leaving overhang on long sides. Spray parchment. Whisk flour, cornstarch, and ⅓ cup cocoa powder in a small bowl.
• Bring milk, butter, oil, vanilla, and salt to a simmer in a small saucepan over medium-low heat. Keep warm over low heat.
• Meanwhile, beat eggs and egg yolks with an electric mixer on medium speed until smooth. Increase speed to high; beat until doubled in volume. With motor running, gradually add sugar; beat until very light and fluffy and mixture falls back on itself in a slowly dissolving ribbon (it should be at least quadrupled in volume), about 5 minutes.
• Reduce speed to medium and gradually stream in milk mixture. Sift one-third of dry ingredients over top; gently fold in until only a few streaks remain. Working in 2 additions, repeat with remaining dry ingredients, scraping bottom of bowl and using as few strokes as possible to keep eggs from deflating (a few streaks are fine). Scrape batter into prepared baking sheet and gently spread to edges of pan. Tap sheet lightly on counter to pop any large air bubbles.
• Bake cake until surface is puffed and springy to the touch, 10-12 minutes.
• Let cake cool in pan 2 minutes, then run a knife along short edges to loosen. Invert onto a wire rack and carefully peel away parchment. Using a fine-mesh sieve, dust cake with cocoa powder. Cover with a large kitchen towel. Place another wire rack on top and flip cake over so towel side is underneath. Remove top rack; dust exposed side with cocoa powder. Starting at one of the long sides, gently roll up warm cake inside towel. Let cake cool, seam side down, 30-35 minutes.
• Do Ahead
• Cake can be baked 1 day ahead. Store tightly wrapped in plastic at room temperature.
• Assembly:
• Carefully unroll towel and cake on a flat surface (cake will curl at the ends and may have a few small cracks but should stay in 1 piece). Position cake so the end that was in innermost part of spiral is closest to you; brush off any excess cocoa.
• Using a pastry brush, gently dab cocoa syrup over entire surface of cake; you may not use it all. Dollop bittersweet ganache over top and smooth with an offset spatula to create an even layer.
• Dollop mascarpone filling over ganache; carefully spread over surface, trying not to blend with ganache and avoiding last inch of cake along long side farthest from you.
• Using towel to lift edge nearest you, reroll cake, keeping towel on exterior. Chill, seam side down, until filling is set, about 30 minutes.
• Transfer filled cake to a baking sheet. Set aside 1/2 cup buttercream for attaching branches. Evenly spread remaining buttercream over cake with an offset spatula.
• Using a long serrated knife, trim 1/2" of cake from each end to create clean edges; discard (or eat!). Slice off a 4" piece of cake. Starting 1" from end, divide 4" piece in half, cutting at a 45° angle, leaving 1" at opposite end. Transfer log to a platter.
• Place angled side of each small piece of cake against roll to create branches, positioning one on top and the other on the side using a large dab of buttercream to secure. Cover any exposed cake on sides with more buttercream but leave cut ends exposed.
• Use spatula to create textured lines in buttercream to look like birch bark.
• Knead together marzipan and cocoa powder on a surface until smooth. Roll out on a sheet of parchment paper to less than 1/8" thick, then cut out wavy strips to look like tree knots; drape over buttercream and press gently to adhere.
• Using either a pastry bag fitted with a very small round tip or a disposable plastic bag with one corner snipped off, drizzle melted chocolate over log to mimic birch bark striations. Chill Bûche de Noël, uncovered, until ready to serve.
• Just before serving, press mushrooms perpendicularly into log in groups of 2 or 3.
• Do Ahead
• Bûche de Noël (without meringue mushrooms) can be assembled 1 day ahead. Wrap in plastic and chill. Attach mushrooms just before serving.