Chop the couverture, bring 200 g of cream to the boil in a saucepan. Remove from the heat and let the chocolate melt in it. Cream butter, 1 pinch of salt and 200 g sugar with the whisk of the hand mixer.
Stir in the eggs one by one. Mix flour and baking powder. Stir in chocolate cream first, then the flour mixture.
Peel apples and cut out the core with an apple cutter, cut apples into thin slices. Put 1/3 of the dough into a greased springform pan (26 cm Ø). Spread 1/3 of the apple slices all around, spread the next layer of dough on top and spread apples all around again, spread the remaining dough in the baking tin and cover the cake with the remaining apples.
Bake in the preheated oven (electric cooker: 175 °C/ circulating air: 150 °C/ gas: see manufacturer) for about 30 minutes.
Caramelise 200 g sugar in a pot. Heat until the caramel has a nice colour. Deglaze with 200 g cream, bring to the boil and simmer until the caramel has dissolved, stir in almond slivers.
Take the cake out of the oven and let it cool down on a cake rack. Drizzle the almond caramel over the cake just before serving.