Passover Sponge Cake

Ingredients

 * 9 eggs, separated
 * 1¾ cup sugar
 * ⅖ cup potato starch
 * ¼ cup cold water
 * ⅗ cup cake flour
 * ½ orange, juice and rind
 * ½ lemon, juice and rind

Directions

 * 1) Separate eggs putting whites in mixing bowl and yolks in cold water.
 * 2) Beat whites by hand or electric mixer until stiff but not dry.
 * 3) Gradually add sugar.
 * 4) Add yolks and water mixture and beat well.
 * 5) Add juices and rinds and beat well.
 * 6) Add cake flour and starch that have been mixed with very low mixer or by hand.
 * 7) Be sure that the flour mixture is thoroughly blended.
 * 8) Put in angel food cake pan and bake about 45 minutes or until done in 350 °F oven.
 * 9) You can improvise by adding nuts, cinnamon-sugar, or other things but the basic recipe is moist and tasty and wonderful especially as the base for fruits).