Passover Sponge Cake Recipe

• 1 x Egg, whole
• 6 x Large eggs, separated
• 1 1/2 c. Sugar
• 1 1/2 Tbsp. Lemon juice
• 1 1/2 tsp Lemon rind, grated
• 1 pkt Vanilla sugar
• 1/2 c. Potato starch
• 1/4 c. Matzoh cake flour
•     ds Salt

Directions