Marble Cake
1 cup butter 2 cups powdered sugar 4 eggs 3 cups flour 1 cup sweet milk 2 teaspoons baking powder 1 square unsweetened chocolate Beat the butter and sugar to a cream; add the yolks of the eggs, then the sifted flour and baking powder alternately with the milk. Fold in the whites; take one third of the batter out and add to it the chocolate melted and thinned with a little hot water. Into the baking pan pour the yellow mixture to the depth of one inch; drop into this in two or three places a spoonful of the dark mixture, giving it a slight stir with the tip of a spoon and spreading it in broken circles around the dark mixture. Pour in more yellow batter, then more brown, proceeding in the same way until all the batter is used. Bake in a moderate oven.