Roughly chop the chocolate coating. Heat the cream and remove from the heat. Add couverture and 100 ml liqueur and melt while stirring. Fill chocolate cream into a tall mixing bowl and chill for at least 3 hours. Heat milk and 3 tablespoons of liqueur. Roughly chop the chocolate, melt it in the milk, let it cool down.
Cream butter, sugar, vanillin sugar and salt. Stir in the eggs one by one. Mix flour, 50 g cocoa and baking powder and stir in alternately with the chocolate milk. Fill the dough into a greased springform pan (26 cm Ø) and smooth it down. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 50-60 minutes. Let the base cool down. Warm up the jelly a little and stir until smooth. Cut the cold base horizontally 2 times. Spread the bottom and middle cake layer with jelly. Put the cake back together. Whip the chocolate liqueur cream with the whisk of the hand mixer for approx. 1 minute.
Let the base cool down. Warm up the jelly a little and stir until smooth. Cut the cold base horizontally 2 times. Spread the bottom and middle cake layer with jelly. Put the cake back together. Whip the chocolate liqueur cream with the whisk of the hand mixer for approx. 1 minute. Spread the chocolate cake, using a pallet and hot water, with the chocolate cream and chill for at least 1 hour. Dust the cake with approx. 1 tablespoon of cocoa before serving