Start the oven at 175 degrees Celsius.
Melt the margarine in a casserole, and take away the casserole from the stow.
Whip the eggs and the sugar with an electrical mixer .
Add the flour, vanilla sugar, cacao powder and the margarine in the bowl with egg and sugar, whip it all together with the electrical mixer.
Put baking paper in an oven form approx 30 cm x 40 cm.
Pour in the mixture in the oven form, and put it in the lower part of the oven for 15 minutes.
Take out the cake from the oven and let it cool down in room temperature.
Make strong coffee and let it get cold.
Melt the margarine in a casserole.
Add the coffee, cacao powder, vanilla sugar and the icing sugar in the casserole while stirring. Let it all melt together.
Let the frosting cool down a bit, and then put the frosting evenly on the cake.
Sprinkle the coconut flakes on the frosting evenly.
Let the cake in the fridge for a few hours.
Cut the cake in approx 30 squares before serving.