Put the ingredients for the base in a bowl and stir well together.
Spread the dough on a lightly greased baking sheet and cook at 180 degrees for about 45 - 60 minutes. to bake.
For the topping, mix the softened butter with the powdered sugar, the semolina and the bitter almond flavor.
Now distribute the mixture on the baked, still slightly warm base with a hot knife and cover with chocolate icing.
I got the recipe from a friend from the former GDR. There the mass was called false marzipan. Hence the name for the cake. It is very powerful but also very tasty.