Base:
Mix butter and sugar until puffy. Add the flour and stir until smooth. Press the dough evenly on oven tray with grease proof paper. Bake for 15-20 minutes in 175ºC. Let cool.

Caramel:
Heat up all ingredients in a saucepan until boiling. Stir continually. Let boil on low heat, while stirring, for about 10 minutes. Pour the caramel over the cake and let cool.

Chocolate:
Melt the chocolate in separate bowls. Pour the chocolate over the caramel and make a marble pattern with a fork or spoon.

Let the chocolate set before you cut the cake.