Wash the lemons and rub them dry. Peel the peel of one of them thinly as a spiral, and grate the peel finely from the other. Squeeze both lemons
1/2 l water, apple juice, Calvados, 125 g sugar, cinnamon stick, lemon juice and lemon spiral in a big pot boil up
Peel the apples and cut out the cores with an apple corer. Put the apples into the boiling stock, cover and stew for about 10 minutes. Remove from the stock, drain. Cool down
Grease a springform pan (26 cm Ø; approx. 8 cm high) and dust with flour. Coarsely grate marzipan, stir with jam until creamy
Cream fat, 125 g sugar, vanillin sugar, 1 pinch of salt and grated lemon peel. Stir in the eggs one by one. Mix flour and baking powder and stir in briefly with the liquid cream. Spread into the springform pan. Place the apples close together. Pour the marzipan mixture into a plastic bag, cut off a small corner at the bottom and squirt into the apples
Bake in the preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2) for 50-60 minutes. Let them cool down. Decorate with coarse and icing sugar