Place all the ingredients together in a large bowl except the flour and the cocoa powder and mix well. Finally add the flour little by little until you have a nice dough.

Divide the dough into two equal parts and add the cocoa powder to one half so that it turns  dark brown. Roll out the white dough into a sheet. Shape the dark dough into a roll and place it at one end of the white dough sheet. Then roll the white dough with the dark one and cut into round slices.

Bake in the oven at 180°C and then pour lukewarm suryp over them.