Chocolate Angel Food

11 egg whites
2/3 c flour
1/3 c cocoa
1-1/2 c sugar
1/2 t baking powder
1/4 t salt
1 t cream of tartar
1 t vanilla

Beat whites, before stiff add salt and cream of tartar. Add sifted sugar and baking powder. Add flour and cocoa which are sifted together. Vanilla. Bake as other angel food cakes.

Note: Beware of the pitfalls of this recipe. Usually the flour is folded into the whites in angel food recipes. This looks like an interesting cake, though - chocolate angel food?