Grease a springform pan (26 cm Ø) and sprinkle with breadcrumbs. Peel, halve and core apples. Scratch lengthwise on the curved side with a fork or cut in with a knife. Sprinkle with lemon
Cream 125 g fat, 100 g sugar, vanillin sugar and 1 pinch of salt. Stir in the eggs one by one. Mix flour and baking powder and stir in alternately with the milk in portions. Spread into the mould
Place the apple halves on the dough with the curvature facing upwards. Bake in the preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2) for approx. 30 minutes
Roughly chop the nuts. Caramelise 75 g sugar until golden yellow, remove from the heat. Stir in 35 g fat. Gradually stir in Calvados, place on the stove for a short time, stir until smooth. Remove from heat and stir in the nuts. Spread on the cake immediately. Continue baking at the same temperature for about 10 minutes. Remove from the pan immediately. Cool down