Put the cornflakes and butter biscuits in a freezer bag and crumble them with the dough roll. Melt 100 g butter in a saucepan, mix with the crumbs and 25 g sugar. Spread the bottom of a springform pan (24 x 24 cm) with oil. Press the crumb mixture firmly into the base. Put it in a cold place
Wash lemon, grate dry, grate peel. Halve the lemon, squeeze half of it. Mix quark, sour cream, 100 g sugar, vanillin sugar, pudding powder, eggs and 1 tbsp lemon juice. Put flour, 75 g sugar, 75 g butter and lemon zest into a bowl and knead first with the dough hooks of the hand mixer, then with your hands to a crumbly dough. Wash and drain the currants and pluck the berries from the stalks
Pour the cheese mixture onto the crumb base and smooth it down. Sprinkle with currants and sprinkle with crumbles. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 35 minutes, remove from oven and allow to cool. Whipped cream tastes good with it