Cut the fish into small serving-size pieces. Keep the richer, heavier fish-eel, haddock, cod, bass- separate from the more delicate types. Cut the live lobsters into pieces. Wash and clean the mussels.
Cut the white part of the leeks into small pieces. Chop the onion and the garlic. Peel and seed the tomatoes.
Heat the olive oil in a large kettle. Add the vegetables and let them cook well together. Add the bouquet garni and the heavier fish. Let this cook for about 7 to 8 minutes. Add the lighter fish, the lobster, and a good pinch of saffron. Cover with water or fish broth, season to taste with salt, pepper and cayenne, and bring to a boil. Cook for 15 minutes. Add the mussels and cook until they open. Place the fish in a deep serving dish and pour the hot liquid over it. Serve garlic flavored croutons separately.
Recipe Courtesy of James Beard's Fish Cookery