Crush the biscuits (best in a freezer bag) and place in a bowl. Dissolve and mix in butter, stir in powdered sugar. Process everything into a smooth dough. Spread in a springform pan and press firmly.
For the mascarpone cream, mix the mascarpone, quark, vanilla sugar, orange or lemon juice and sugar into a smooth dough and spread on the base. Refrigerate.
Prepare the jelly according to the instructions on the package - but only with ¼ l of water. Fold the raspberries under the hot jelly. Allow to cool slightly.
Finally, spread on the mascarpone cream and refrigerate for approx. 3 hours until consumption.