1. 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.
2. 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..
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3. 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.
4. 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.
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