Peel, halve and core apples and sprinkle with lemon juice. Coarsely grate the marzipan and mix it with the poppy seed filling until smooth. Grease a fat pan (approx. 32 x 39 cm; at least 3.5 cm deep) and sprinkle with breadcrumbs
Cream fat, sugar, vanilla sugar, lemon peel and 1 pinch of salt. Stir in the eggs one by one. Mix flour, starch and baking powder and stir in briefly, alternating with the sour cream. Spread on the fat pan
Place the apples on the dough with the curvature facing down. Spread the poppy seed marzipan mixture with two teaspoons into the apple depressions. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/gas: level 2) for approx. 50 minutes
Take the cake out of the oven. Stir jam until smooth, spread thinly on the hot cake. Let it cool down. Cream tastes good with it