Make a strong coffee and let it cold (2 cups boiled water + coffee). Also add the rum or brandy

Add the white mass to yolk mass and carefully mix with a spoon. Creme is ready.

Put each biscuit into coffee mass for a millisecond and remove. It just needs to become a bit wet.

Order one layer biscuits and one layer creme. There should be 2-3 layers. Put into fridge for at least 1 hour (or less if you are as inpatient as me:))

Pour done cocoa over the cake while serving