Cream fat, 150 g sugar and vanilla sugar with the whisk of the hand mixer. Stir in the eggs one after the other. Mix flour and baking powder and stir into the dough alternately with the milk. Grease a springform pan (26 cm Ø) and dust with flour. Pour the dough into it and smooth it down.
Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) on the lower rack for approx. 30 minutes. Bring raspberry jelly to the boil, simmer gently for about 4 minutes and let cool off. Chop the pistachios. Roast almond flakes in a pan without fat. Take the cake out of the oven and after 10 minutes carefully remove it from the pan. Let the base cool down on a cake rack. Beat the mascarpone, quark, liqueur, lemon juice and 100 g sugar with the whisks of the hand mixer for about 5 minutes until creamy. Place a springform pan rim around the cake base and spread half of the cream evenly on the base. Put raspberry jelly in a freezer bag, cut off a small corner and spray lines/curves on the cream. Spread the other half of the cream on top and once again spray with raspberry jelly pattern.
Let the base cool down on a cake rack. Beat the mascarpone, quark, liqueur, lemon juice and 100 g sugar with the whisks of the hand mixer for about 5 minutes until creamy. Place a springform pan rim around the cake base and spread half of the cream evenly on the base. Put raspberry jelly in a freezer bag, cut off a small corner and spray lines/curves on the cream. Spread the other half of the cream on top and once again spray with raspberry jelly pattern. Pull through the pattern with a wooden skewer. Decorate the cake with raspberries, pistachios and flaked almonds and chill for at least 1 hour