Put 150 g flour, baking powder, 75 g sugar, salt, 1 egg and 75 g butter in pieces in a bowl. Knead first with the dough hooks of the hand mixer, then briefly with your hands to a smooth short pastry. Wrap in foil and chill for about 45 minutes
Separate 6 eggs. In a bowl mix quark, 150 g sugar, lemon juice and egg yolks with the whisks of the hand mixer. Sieve the starch onto the quark mixture and fold in. Beat the egg whites and cream separately until stiff. Carefully fold in first the cream, then the beaten egg white
Roll out the dough on a floured work surface to a round shape (approx. 34 cm Ø), place in a greased springform pan (28 cm Ø) and press up at the edges. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 10 minutes
Knead 100 g flour, 75 g sugar, vanillin sugar and 75 g butter into crumbles. Remove the mould from the oven, pour in the quark mixture and sprinkle with crumbles. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 1 hour, after approx. 40 minutes cover the cake with foil. Remove the cake, let it cool down and dust with icing sugar. Whipped cream tastes good with it
Waiting time approx. 35 minutes