Separate the eggs. Using an electric mixer beat the egg whites until stiff and set aside
Beat the egg yolks for 2 min. at high speed. Add the lemon juice, sugar and lemon rind and beat another 2 minutes at medium speed
Gradually add the sifted potato starch and continue mixing at medium speed an additional 2 minutes
Fold the beaten egg whites gently but thoroughly with the egg yolk mixture
Place in a non-greased 2-piece 10" tube pan and bake in preheated 350 degree F for 55-65 minutes or until cake springs back when firmly touched with fingers
Invert pan and cool thoroughly before removing from pan.
