1-First: prepare sugared cranberries and rosemary by simmering water and part of the sugar to make syrup. Soak cranberries and rosemary in the syrup, let dry, then toss in remaining sugar and set aside. This step not only enhances flavor but also brings a sparkling touch to your finished cake.

2-Preheat oven to 350°F and line a large jelly roll pan with parchment paper and grease it well. Sift together the cake flour, cocoa powder, baking powder, and salt to ensure a smooth batter. Whip the egg whites with half the sugar until stiff peaks form, which helps create that light, airy texture Buche De Noel is known for.

3-Whisk the egg yolks with the remaining sugar, oil, and vanilla extract until thick and light, then gently fold in the whipped egg whites and dry ingredients in stages. Spread the batter evenly in the pan, tap to release air bubbles, and bake for 15-16 minutes until the cake feels springy.

4-Immediately invert the hot cake onto a cocoa-dusted parchment towel and roll it tightly with the towel to cool. This technique prevents cracking and keeps the shape intact, as noted in tips like using room temperature eggs for better volume.

5-For meringue mushrooms, whip the egg white with cream of tartar and sugar until glossy, then pipe shapes and bake at a low temperature for 2 hours. Attach the stems and caps with melted chocolate for those cute, edible details.

6-Whip the heavy cream with liqueur, confectioners’ sugar, and cocoa powder until medium to stiff peaks form, then unroll the cooled cake, spread the whipped cream, sprinkle chopped hazelnuts, and re-roll. Slice off one end diagonally to create a branch, spread the ganache, and texture it with a fork for a bark-like look.

7-Decorate with meringue mushrooms, sugared cranberries, rosemary, and dust with confectioners’ sugar before serving. Follow the directions closely, and you’ll have a showstopper ready for 10-12 slices of pure joy.