Passover Chocolate Sponge Cake

12 Eggs, separated

1 1/2 c Sugar

2 tb Cold water

Juice and grated rind of 1 -orange 1/2 lb Sweet chocolate, grated

3/4 c 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.