7 eggs, separated
1 c. sugar
3/4 c. cake flour
1/4 c. potato starch
Juice and rind of 1/2 lemon

Beat yolks until thick and lemon colored. Add lemon juice and rind. Beat egg whites until they hold a point. Add sugar gradually to whites and continue to beat in. Fold beaten egg yolks into whites. FOLD (DO NOT BEAT) in cake flour and potato starch, sifted together. put lightly in sponge cake pan. Bake in moderate oven until cake springs back at touch, about 50 minutes.