Prepare the quark-oil dough and roll it out on a baking sheet lined with baking paper. Alternatively, you can also use sweet yeast dough.
Melt the butter, stir in the remaining ingredients for the topping and spread on the dough.
Knead the ingredients for the crumble and pour over the topping.
Bake at 175 ° for 30-45 minutes, depending on the oven. Mix the powdered sugar with lemon juice to a glaze and distribute on the cake while it is still warm.