Roughly chop the chocolate and melt in a bain-marie. In the meantime, finely crumble the Amarettini. Line the bottom of a springform pan (24 cm Ø) with baking paper. Put the rim of a springform pan around it. Mix crumbled amarettinis and melted chocolate well.
Pour evenly onto the springform base with a large tablespoon and press down. Refrigerate the base for about 1 hour. For the cream, soak gelatine in water. Stir cappuccino powder and 1 tablespoon of warm water until smooth.
Mix mascarpone, cream, quark, vanilla sugar, sugar and lemon juice with the whisks of the hand mixer. Squeeze out the gelatine and dissolve in a small pot at low heat. Stir droplets into the mascarpone cream.
Spread the mascarpone cream loosely on the chocolate base and chill for another 4 hours. Remove from the mould with a sharp knife. Dust with cocoa to decorate. If desired, cover with a fork and spoon beforehand (remove very carefully afterwards).
Serve decorated with amarettini and Cape gooseberries as desired. Makes about 16 pieces.