4 egg yolks
1/4 cup sugar
1/2 teaspoon vanilla
4 egg whites
1/2 cup sugar
3/4 cup sifted cake flour
1 teaspoon baking powder
1/4 teaspoon salt
Beat egg yolks till thick and lemon-colored; gradually beat in 1/4 cup sugar; add vanilla.
Beat egg whites till soft peaks form; gradually add 1/2 cup sugar and beat till stiff peaks form. Fold yolks into whites. Sift together flour, baking powder, and salt; fold into egg mixture.
Spread batter evenly in greased, waxed-paper-lined jelly-roll pan.
Bake in moderate oven (375°F) about 12 minutes or till done.
Loosen sides, turn out on towel.
Peel off paper.