Peel and halve apples and cut out the core. Cut the apple halves into a fan shape and sprinkle with lemon juice. Crumble the marzipan into large pieces. Cream fat, marzipan, sugar, vanillin sugar and salt with the whisk of the hand mixer. Stir in yoghurt. Mix flour and baking powder and stir in portions.
Put the dough into a greased springform pan (26 cm Ø), smooth it down, distribute the apple halves evenly and press them lightly into the dough. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 55 minutes. Remove the cake, let it cool down on a cake rack and remove from the tin. Roast the almonds in a pan without fat while turning for approx. 5 minutes. Heat up the jam and brush the cake with it. Sprinkle with almonds.