Marmorkuchen (marble cake) with milk:
Ok the first try wasn´t that pretty but yesterday I got it right. It´s really obvious for me that there is a coincidence that spring started with my two cakes I backed. The biggest mistakes on cake one was too less buttering of the form and not breadcrumbed. I enhanced the recipe a bit due to the size of the cake form:

250g butter
250g sugar
250g flour
4 eggs
3 spoons of real cacao powder for the other half of the dough
1 brief of vanilla sugar
a bit of salt
a bit of baking powder
a bit of rum 

50 minutes on 180 Celsius, thats it! Best served with fresh cooled milk from a farm.