Instructions: 1. Preheat oven to 325 degrees F (165 degrees C).

2. In a medium bowl, mix confectioners sugar, cake flour, and cocoa.

Sift together 5 times, and set aside.

3. In a clean large bowl, whip egg whites, salt, and cream of tartar with an electric mixer on high speed until very stiff.

Fold in white sugar 2 tablespoons at a time.

Fold in flour mixture, a little at a time, until fully incorporated.

Stir in vanilla.

Pour into a 10 inch tube pan.

4. Bake at 325 degrees F (165 degrees C) for approximately 1 hour.

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