Finely grind the poppy seeds. Bring 1/2 litre of milk to the boil, add the poppy seeds and simmer for about 30 minutes, stirring continuously. Drain the poppy seeds on a sieve and let them cool down. Heat 150 g fat and honey in a pot.
Cut the vanilla pod lengthwise and scrape out the pulp. Stir vanilla pulp and nuts into the honey-fat mixture. Simmer at low heat for another 15 minutes. Add the poppy seed mixture. Mix quark, oil, remaining milk, egg, vanilla sugar and 75 g sugar with the dough hooks of the hand mixer.
Mix 400 g flour and baking powder and knead into the quark mixture. For the crumbles, knead 200 g flour and fat and the remaining sugar. Knead the quark oil dough again and roll out on a greased fat pan.
Spread the poppy seed mixture on top and spread the crumbles on top. Bake in the preheated oven (electric: 175°C / gas: level 2) for approx. 35 minutes.