Knead 300 g flour, 75 g sugar, salt, 150 g fat in pieces, 1 egg and 3-4 tablespoons ice-cold water first with the dough hooks of the hand mixer and then briefly with your hands until smooth. Cover and chill for about 30 minutes.
Grease a fat pan (approx. 32 x 39 cm; approx. 3.5 cm deep) and dust with flour. Roll out the dough with a little flour and press it up at the edges. Prick the base several times with a fork. Pre-bake in the preheated oven (electric cooker: 200 °C/recirculating air: 175 °C/gas: level 3) for approx. 15 minutes. Let cool down for approx. 30 minutes
Separate 10 eggs. Mix 100 g butter, 50 g sugar and flavour creamy. Stir in the egg yolks one by one. Briefly stir in quark, milk, 25 g flour and starch. Beat the egg whites in 2 portions until stiff, adding 100 g of sugar to each portion. Fold into the cheese mixture
Halve the mass. Fold 250 g ground nuts and cocoa into one half. Spread on the dough. Sprinkle 50 g of ground nuts on top. Spread the remaining quark mixture on top and bake at the same temperature for about 40 minutes. Let it cool down
Whip the cream until stiff and allow the vanillin sugar to trickle in. Cut the cake into pieces. Decorate with cream and nuts