Peel, quarter and slice the apples. Put in a bowl and drizzle with 1 tablespoon of lemon juice.
Slice the marzipan (put it in the freezer shortly beforehand, then it`s easier to slice it) or pluck it into small pieces.
Mix the margarine / butter with 250g sugar, vanilla sugar, salt and the marzipan pieces until creamy. Stir in 4 eggs one after the other. Mix the flour with the baking powder and stir in.
Grease a baking sheet (32x39cm) and dust with flour. Spread the batter on top. Spread the apple wedges on the dough and sprinkle with 2 tablespoons of sugar.
Bake in a preheated oven at 175 ° C for 30 minutes.
Mix 2 eggs with sour cream and vanilla pulp. Carefully pour the topping over the cake and bake for another 20-25 minutes at the same temperature. Chopstick sample.