Ingredients
Cake:
- 1 c sugar, divided
- 1/2 c all-purpose flour
- 1/4 c unsweetened cocoa powder
- 5 eggs, room temperature, separated
- 1 tsp. vanilla extract
- 1/2 tsp. baking powder
- 1/4 tsp. baking soda
- 1/4 tsp. salt
- 1/4 tsp. cream of tartar
Filling:
- 1 c heavy whipping cream
- 1/2 c powdered sugar 1/4 cup for dusting tea towel
- 1 tsp. coffee granules
- 1/2 tsp. vanilla extract
Frosting:
- 2 c sifted powdered sugar
- 1/3 c unsweetened cocoa powder
- 1/3 c butter, room temperature
- 2 tbsp. milk
- 2 tbsp. strongly brewed coffee
- 1 tsp. vanilla extract
Instructions
- Preheat oven to 350 degrees F and line a 10x 15-inch, rimmed jelly roll pan with parchment paper. Generously grease the paper.
- Combine flour, cocoa powder, baking powder, baking soda and salt in a medium bowl and set aside.
- In a large bowl, beat together egg yolks and 1/2 cup sugar until light and fluffy. Mix in vanilla extract.
- 1/4 cup at a time, add dry ingredient mixture to the egg yolks and mix until smooth and incorporated. Set aside.
- In a second large bowl, beat egg whites and cream of tartar until soft peaks form 4-6 minutes.
- Gradually add remaining sugar to egg whites, then turn speed up to high and beat until stiff peaks form.
- Gently fold 1/3 cup egg whites into chocolate mixture. Then, a little at a time, fold chocolate mixture carefully into egg whites until homogeneous.
- Pour mixture into jelly roll pan and bake for 12-15 minutes, or until cake is springy to the touch. Don't over bake.
- Remove cake from oven and run a knife to loosen it from the edges. Immediately invert it onto a clean tea towel dusted with powdered sugar.
- Pull off parchment paper and roll cake up in tea towel, starting with the short end. Let cool completely.
- In a large bowl or mixer, beat heavy cream until soft peaks from, then slowly add 1/2 cup powdered sugar.
- Add vanilla extract and instant coffee and beat until stiff peaks form. Refrigerate 30 minutes.
- When cake is completely cool, unroll and spread filling evenly over the whole cake, leaving a 1/2- inch border around the edges.
- Re-roll cake into a log, transfer to serving plate and refrigerate.
- For the frosting: cream together butter, sugar and cocoa powder until smooth and fluffy.
- Add milk, coffee, and vanilla, and beat until smooth. Frost cake, then use a fork or knife to decorate and make log look like a tree. Garnish with more powdered sugar and enjoy!