Boil the peeled potatoes for approx. 5 minutes, cut into slices and put half of them in an ovenproof dish with half the sliced courgette, garlic, green pepper and leek.
Cut the fish into cubes and place them on top of the vegetables. Sprinkle 10 pinches of black pepper, 1 tsp. salt, black olives and pour over 1 tbsp. olive oil. Repeat the process with the vegetables so that the last half is also used, and sprinkle on salt and black pepper as well as olive oil on top.
