Heat olive oil in a pot. Sweat the shallot, the halved mushrooms and half a bell pepper in it.
Pour in the stock and crème fraîche and bring to the boil. Add coarsely diced fish fillet pieces and let simmer for 5 minutes over low heat. Season with lemon juice, salt, pepper, paprika powder and nutmeg and season to taste.
Fold in the tomato and bell pepper cubes, warm up a little, but don`t let boil any more.
Serve sprinkled with chopped parsley. With oven-warm baguette.