Cook the pasta in plenty of boiling salted water for about 10 minutes. drain
Clean, wash and cut the leek into pieces. Steam in 1-2 tablespoons of hot oil for about 5 minutes. Season with salt and pepper
Wash the tomatoes and cut into thick slices. Layer pasta, leek and tomatoes alternately in a lightly oiled casserole dish
Wash the oregano, pluck the leaves. Boil 200-250 ml water. Stir in broth and tomato paste. Season with pepper and oregano. Pour tomato stock over noodles and vegetables. Cook in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for about 15 minutes
Whisk milk and eggs, season. Halve and stone the olives if necessary. Crumble the feta cheese and spread it on the casserole with the olives. Pour the egg milk over it and bake for another 15-20 minutes