Passover Sponge Cake

Based on the recipe from susie fishbein's 'passover by design'

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.

lemon zest, lemon juice, eggs, sugar, club soda, potato starch, matzo cake meal