Separate eggs. Beat egg whites until stiff. Add vanillin sugar and 50 g sugar. Whip the egg yolks, 2 tablespoons of rum and 70 g of sugar to a thick cream. Fold in the beaten egg whites in portions.
Mix flour, starch and baking powder, fold in briefly. Line the bottom of a springform pan (26 cm Ø) with baking paper. Pour in the dough and bake in a preheated oven (electric: 175 ° C / gas: level 2) for about 30 minutes.
Let it cool down on a cake rack. Finely chop 100 g chocolate. Mix mascarpone, quark, remaining sugar and rum until smooth. Beat 100 g cream until stiff and fold in. Set 1/3 of the cream aside.
Fold the chocolate into the remaining cream. Halve the sponge horizontally and fill with the chocolate mascarpone cream. Spread the rest of the cream on the cake in a wavy pattern. Drain apricot halves well.
Slowly heat the remaining chocolate, butter, icing sugar and remaining cream over a low heat until the chocolate has melted. Cover half of the apricots with the icing, allow to dry and decorate the cake with it.
Results in about 16 pieces.