Passover Chocolate Sponge Cake
Juice and grated rind of 1,
Matzo cake flour
Preheat oven to 350^F.
Beat egg yolks and sugar until light and fluffy (about 7 minutes).
Add cold water, orange juice, orange rind, chocolate and cake flour.
Gently fold in stiffly beaten egg whites.
Pour into a 10-inch tube pan with removable insert. Bake for 55 to 65 minutes or until cake springs back when gently pressed. Cool completely, inverted on cake rack, before removing from pan.