Pound eggs with sugar until of white colour, add sour cream, melted margarine, beat well, and pour flour mixed with soda. Quickly knead pastry and divide it in two. Add cacao powder to one part to get the necessary colour.

Put brown and white party on a greased baking form in turns, using a spoon. Bake for about 30 minutes over 430 ^oF (220 ^oC).

Icing: bring milk to boil, add sugar, diluted vanillin and boil until a syrup drop, put into a glass with cold water and set at the bottom, has a shape something like of a flat cake. Add butter to the hot paste and mix well.

Unmold the pie, cool and top it with ice evenly distributing the icing with a knife. Combine part of the icing with cacao powder to make a pattern.