Clean, wash and cut the leek into rings. Peel and slice the onions. Dice bacon. Heat 1 tablespoon of oil and leave the bacon out. Add onions and leek, fry and deglaze with broth. Stew for 5 minutes.
Season to taste with salt and pepper. Remove from the pan and drain well. Cut Cabanossi into slices. Mix quark, 6 tablespoons of oil, milk and 1 teaspoon of salt. Mix flour and baking powder, knead into the quark mixture. Knead the dough with the fried onions on a floured work surface and roll out round (approx. 36 cm Ø). Grease a springform pan (26 cm Ø). Put the dough in and press the rim up. Sprinkle with breadcrumbs and cover with sausage slices. Put leek on top. Whisk sour cream, eggs, semolina, marjoram, salt and pepper and pour over the leek.
Knead the dough with the fried onions on a floured work surface and roll out round (approx. 36 cm Ø). Grease a springform pan (26 cm Ø). Put the dough in and press the rim up. Sprinkle with breadcrumbs and cover with sausage slices. Put leek on top. Whisk sour cream, eggs, semolina, marjoram, salt and pepper and pour over the leek. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 1 1/4 hours. Leave to rest for approx. 10 minutes and remove from the mould
Waiting time approx. 10 minutes