Cake with Cacao

Description
In Romanian: Chec cu cacao

Ingredients

 * 7 oz/200 g butter,
 * 10 oz/300 g confectioner's sugar,
 * 14 oz/400 g flour,
 * 5 eggs,
 * 1 teaspoon vanilla,
 * 1 tablespoon cacao,
 * butter and flour to grease and dust the pan

Directions

 * 1) Cream the butter with the sugar and vanilla, add the yolks one by one.
 * 2) Mix with flour and then with whipped egg whites.
 * 3) Take 4-5 tablespoons of this mixture and put in a bowl where you mix this with 1 tablespoon cacao.
 * 4) Place half of the plain (without cacao) mixture in the buttered and dusted bread pan, then pour the cacao mixture down the middle over the plain mixture (to obtain a brown strip in the middle, from one end to the other).
 * 5) Then pour the remaining plain mixture. Bake, first at low temperature, then somewhat higher.
 * 6) When done, remove onto a wooden cutting board and cover with a cloth.