Beat separately with a mixer 5 yolks and whites separately 8 with 1 cup sugar. Mix gently and products already beaten them to be added to the oil droplets as hereinafter stir with wooden spoon. Add baking soda mixed with yogurt, flour. The resulting mixture was divided into 4 equal parts, in two of them are put vanilla, while the other two - the chocolate. Pour into greased pan prior alternately four mixtures - with greater spoon in the medium was poured into a spoon white spoon brown and so on until finished mixture. Bake in a moderate oven. Cream: The three remaining yolk break with a little milk, the flour was added, stirred it well, and then added to the hot milk and sugar. Stir until thickened, the butter is added and stirred until dissolved. The base is brushed finished with cream.