Bring 175 ml milk to the boil, add poppy seeds and simmer over a low heat for about 20 minutes. Remove from the heat and allow to cool slightly. Peel and halve apples and cut out the cores.
Drizzle apple halves with 4 tablespoons of lemon juice. Mix quark, oil, 75 ml milk, salt, vanillin sugar and 75 g sugar. Mix flour, starch and baking powder, add and knead to a smooth dough with the dough hooks of the hand mixer.
Remove 1/6 of the dough and set aside. Roll out the rest of the dough into a circle (approx. 34 cm Ø) on a floured work surface. Place in a well greased springform pan (26 cm Ø), pressing the rim up.
Mix poppy seed mixture, eggs, 100 g sugar, pudding powder, crème fraîche and sour cream. With floured hands turn thin cords from the remaining dough. Dab apple halves dry with kitchen paper, cut them several times and put them into the springform pan.
Pour the poppy seed mixture over it. Lay the cords on top in a grid pattern. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 50 minutes. Cover the cake with aluminium foil if necessary.
Take out the cake and let it cool down. Dust with icing sugar. Whipped cream tastes good with it.