Peel and quarter the apples and cut out the core. Cut the apple quarters in half crosswise and mix them in a bowl with lemon juice
Roughly chop 300 g chocolate. Melt butter and chocolate in a small pot at low heat while stirring. Remove from the heat and allow to cool for 5-10 minutes. Coarsely chop nuts
Mix flour and baking powder. Whisk the eggs. Put chocolate in a large mixing bowl. Add sugar, vanilla sugar, salt, eggs, 200 g nuts and flour. Mix briefly with the whisk of the hand mixer to a smooth dough
Grease a fat pan of the oven (approx. 36 x 41 cm) well and spread the dough evenly on top. Spread apples on top and sprinkle with the remaining nuts. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 40-45 minutes. Leave to cool on a cake rack for 2-3 hours
Coarsely chop 100 g chocolate and coconut oil. Melt chocolate, coconut oil and cream at low heat, stirring. Leave to cool for about 15 minutes, then scoop over the cake with a spoon. Leave to dry in a cool place for about 2 hours
waiting time approx. 4 hours