Mix 150 g wheat flour with 1/2 teaspoon baking powder and add 75 g sugar, 1 package (2-3 teaspoons) vanilla sugar, a dash of salt, 1 egg and 75 g soft butter. Mix these ingredients and knead until you get a soft dough. If it is too sticky, put it in the fridge for a while.

Take 2/3 of the dough and roll it out on the bottom of a springform (diameter 28 cm). Knead 1 tablespoon of flour into the remaining dough and form a rim (like in the picture). Pierce several times with a fork.

Put this into the preheated oven at 200-220°C for about 10 minutes.

Filling:
Meanwhile, mixh 750 g Quark (curd cheese, plain soft cheese, whatever) with 150 g sugar, 3 soupspoons of lemon juice and 50 g starch. Beat the whites of four eggs, mix the four yolks, beat 200 ml cream and add everything to the Quark.

Spread the Quark evenly on the pre-baked dough and put into the oven for 70 to 80 minutes at 170°C.

After the cake is done, it should be left in the oven for about 20 minutes with the door half open and the heat turned off.

Nota bene: I think the Quark this recipe calls for is supposed to have 10 or 20 percent fat in dry matter.

(But I guess it should turn out okay with any Quark.)