Put flour, 150 g sugar, 1 packet of vanilla sugar, 175 g butter in flakes, 1 egg and salt in a bowl. First knead into crumbles with the dough hooks of the hand mixer, then with your hands. Grease a springform pan (26 cm Ø). Put about half of the sprinkles in the form and press it to a smooth bottom, put it in a cold place. Melt 100 g butter, let it cool down a little.
Mix the low-fat and creamy quark, 200 g sugar and 1 packet of vanillin sugar with the whisks of the hand mixer until smooth. Stir in 4 eggs, cream and lemon zest one after the other. Stir in pudding powder and finally stir in butter. Spread the plum puree on the base, leaving a small rim free. Put the cheese mixture on top and smooth it down. Bake in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) on the lower rack for 50-60 minutes. After about 20 minutes of baking time, spread the remaining crumbles on top and finish baking. Let rest for 10 minutes with the oven door open. Leave to cool on a cake rack.
Bake in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) on the lower rack for 50-60 minutes. After about 20 minutes of baking time, spread the remaining crumbles on top and finish baking. Let rest for 10 minutes with the oven door open. Leave to cool on a cake rack. Serve sprinkled with sugar crystals. Whipped cream tastes good with it