Ingredients
6 large eggs, separated, room temperature1 cup sugar, divided1 teaspoon vanilla extract1/4 cup all-purpose flour1/4 cup baking cocoa1/4 teaspoon salt1/2 teaspoon cream of tartar1-1/2 cups heavy whipping cream2 tablespoons confectioners’ sugarAdditional confectioners’ sugar
Preparation
Place egg whites in a small bowl; let stand at room temperature for 30 minutes. In a large bowl, beat egg yolks on high speed until light and fluffy. Gradually add 1/2 cup sugar, beating until thick and lemon-colored. Stir in vanilla. Combine the flour, cocoa and salt; add to egg yolk mixture until blended.
Beat egg whites on medium speed until foamy. Add cream of tartar; beat until soft peaks form. Gradually add remaining sugar, 1 tablespoon at a time, beating on high until stiff peaks form. Stir a fourth of the egg white mixture into chocolate mixture. Fold in remaining egg white mixture.
Line a greased 15x10x1-n. baking pan with parchment; grease the paper. Spread batter evenly in pan. Bake at 350° for 12-15 minutes or until cake springs back when lightly touched in center (do not overbake). Cool for 5 minutes; invert onto a kitchen towel dusted with confectioners’ sugar. Gently peel off parchment. Roll up cake in the towel jelly-roll style, starting with a short side. Cool completely on a wire rack.
In a large bowl, beat cream and confectioners’ sugar until stiff peaks form; chill. Unroll cake; spread with whipped cream to within 1/2 in. of edges. Roll up again. Place seam down on serving platter; chill. Dust with additional confectioners’ sugar before serving.
