This is a german classic every café or bakery would sell this cake. Depends on the time of the year the topping could also be made with red currents which is actually my favourite. It is not very often we get those red currants here in summer, if we do, it is only for a very short time. I used frozen cranberries before it worked well but if you do use frozen berries roll them in flour before adding to the topping.
Coastal Delights 