Peel onion and cut into thin rings. Fry the minced meat in a coated pan without fat until crumbly. Season with salt and pepper and remove. Put the onion, sauerkraut, ham and caraway seeds into the hot pan and fry for approx. 5 minutes, turning until lightly browned. Season to taste with salt and pepper. Mix with the mince and let it cool down
Wash parsley, shake dry and cut into fine strips. Mix sour cream, eggs and 3/4 of the parsley. Season with about 1/2 teaspoon salt and a little pepper. If necessary put it in a cold place
Grease a square tart mould with lift-off base (approx. 22.5 x 22.5 cm) and dust with flour. Mix quark, 2 tbsp. milk, oil and 1 pinch of salt. Mix flour and baking powder, add to the quark mixture and knead first with the dough hooks of the hand mixer, then with your hands to a smooth, supple dough. If the dough is too firm, add approx. 1 tbsp. milk
Roll out the dough to a thin square (approx. 27 x 27 cm) on a slightly floured work surface. Line the mould with the dough. Prick the dough base several times with a fork. Spread the minced sauerkraut filling on the dough. Pour the sour-cream mixture evenly over the dough. Bake in the preheated oven, lower shelf (electric oven: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 30 minutes. Sprinkle with the remaining parsley