Warm the raw marzipan mixture in a bowl in the microwave for 10-15 seconds (it is easier to mix).
Mix in the flour or other dry mass by hand until you get the crumble. Sprinkle on the cake (possibly pre-baked for 10 minutes) and bake (further).
The heat and baking time depend on the cake chosen.
Tip:
If you don`t have a microwave, you can cover the raw marzipan mixture in a freezer bag and pour boiling water over it.
For fruit casseroles or crumbles, place in an ovenproof casserole dish over well-drained fruit (can, frozen, pre-cooked or fresh (berries, fine wedges of apples or pears) and bake until golden brown for approx. 20 minutes.