Drain the cherries in a sieve. Cream butter and 125 g sugar with the whisk of the hand mixer. Stir in the eggs one after the other. Mix flour and baking powder and stir in. Spread half of the dough into a greased springform pan (26 cm Ø) sprinkled with flour
Stir the cocoa and milk into the rest of the dough, spread carefully on the light-coloured dough. Spread drained cherries and marzipan potatoes on the dough. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 30 minutes, remove from oven and leave to cool in the mould for approx. 1 hour
Soak gelatine in cold water. Mix quark, vanilla sugar and 4 tablespoons of sugar. Whip the cream with the whisks of the hand mixer until stiff. Dissolve gelatine, stir in 3 tbsp. quark, stir into the remaining quark, fold in cream. Remove the cake from the tin and surround with a cake ring. Spread the quark cream on the cake and refrigerate for about 1 hour
Coarsely chop the chocolate coating and coconut oil and melt over a warm water bath. Spread the couverture evenly on the cake, let it stand for a short time. Loosen the cake ring and wave the couverture with a cake comb. Refrigerate the cake for another 15 minutes until the icing is firm. Cut the cake into 12 pieces
waiting time approx. 2 1/4 hours