Passover Chocolate Sponge Cake

Ingredients

 * 12 	 	Eggs, separated
 * 1 1/2 	cup 	Sugar
 * 2 	tbsp 	Cold water Juice and grated rind of 1 orange
 * 1/2 	lbs 	Sweet chocolate, grated
 * 3/4 	cup 	Matzo cake flour

Directions
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.