Yolks 3 eggs 11/2 teaspoons baking powder
1 cup sugar 1/4 teaspoon salt
1 tablespoon hot water Whites 3 eggs
1 cup flour 2 teaspoons vinegar
Beat yolks of eggs until thick and lemon-colored, add sugar gradually, and continue beating; then add water, flour mixed and sifted with baking powder and salt, whites of eggs beaten until stiff, and vinegar. Bake thirty-five minutes in a moderate oven, in a buttered and floured cake pan.