Coarsely dice the fat. Knead flour, fat, 250 sugar, 2 eggs, baking powder, cinnamon and vanillin sugar to a crumbly dough. Put in a cool place. In the meantime, mix quark, 6 eggs, 225 g sugar, milk, pudding powder and orange zest to a smooth mixture. Measure 750 g quark mixture and mix with the poppy seed mixture.
Put 2/3 of the dough into a fat pan of the oven and roll out. Pour both curd masses on top in a chessboard pattern and bake in the preheated oven (electric oven: 175 °C/ gas: level 2) for 45-50 minutes on the 2nd rack from below. Mix remaining crumbles with cinnamon. Approx. 20 minutes before the end of the baking time add the crumbles