Passover Sponge Cake - cooking recipe

Ingredients

2 teaspoons lemon zest
1/4 cup lemon juice
9 large eggs, separated
1 3/4 cups sugar
1/4 cup club soda
1/2 cup potato starch
1/2 cup matzo cake meal

Preparation

Preheat oven to 350 degrees.
Beat egg yolks with sugar, soda, and lemon juice on medium high for 3 minutes.
Gradually add the potato starch and cake meal. Set aside.
Beat egg whites until stiff.
Fold yolk mixture into whites.
Add lemon zest. Beat for 2 minutes.
Pour into an ugreased large tube pan. Bake 1 hour and 10 minutes.
Invert until completely cool. Run a knife arond the cake and remove from pan.