This recipe is for a marbled cake that can serve 6 people. It involves melting butter and mixing it with sugar and egg yolks. Milk, flour and baking powder are added to this mixture. Separately, egg whites are beaten until stiff. Half the batter is flavored with cocoa powder and the other half with vanilla. The two batters are layered alternately in a loaf pan and baked for 45-50 minutes.