Mix the Margarine, sugar and flour together with a fork.
Divide the dough in two, and mix one part with the cacao powder, and the other part with the vanilla sugar.
Flatten out the dough parts to equal size squares.
Place the white part on top of the dark one, and roll them together to a long roll.
Place the dough roll in the fridge for ten minutes.
Start the oven at 200 degrees Celsius.
Place a baking paper on a baking sheet.
Cut the dough roll in slices and place the cookies on the baking paper.
Place the cookies in the middle of the oven for seven minutes.