Preheat oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Grease a springform pan (18 cm Ø). For the dough, whisk 100 g butter, 75 g sugar, 1 packet vanilla sugar and 1 pinch of salt until creamy.
Stir in 3 eggs one by one. Mix flour and baking powder, add 4 tablespoons of cream and stir in briefly.
Fill the dough into the mould and smooth it down. Bake in a hot oven for approx. 30 minutes, if necessary cover with aluminium foil after approx. 20 minutes. Take out the cake and let it cool down on a cake rack.
For the chocolate cream, break 140 g chocolate into pieces and melt in a hot water bath. Let cool for 10-15 minutes. Beat 75 g cream until stiff. Stir mascarpone and 1 packet of vanilla sugar until creamy.
First stir in the liquid chocolate and then fold in the cream.
Remove the cake from the pan and cut through horizontally twice. Approx. 1⁄3 Spread the chocolate cream on the lower cake base, place the middle cake base on top. Stir the jam vigorously and spread on the middle cake layer.
Cover with the top soil. Spread the rest of the chocolate cream all around the cake. Chill the cake for about 30 minutes.
Break 60 g of chocolate into pieces for the icing. Melt with 60 g cream and coconut oil at low heat while stirring. Let cool for 10-15 minutes. Then spread over the cake so that the top is covered and the icing runs down the sides a little.
Chill for about 2 hours.
Beat the egg whites and lemon juice until stiff, add 60 g sugar and continue beating for 1-2 minutes until the sugar has dissolved. Stir in starch. Pour meringue mixture into a piping bag with a large perforated spout.
Decorate the cake with tuffs close together. Brown the tuffs briefly with a kitchen gas burner. Refrigerate the cake again for about 1 hour.