There are many ways to make this patriarch of fish stews. Serve all ingredients in large howls or pass the fish around on a platter. Scallops and lobster can also be included.
Combine oil, onions, garlic, and bay leaf in Dutch oven. Cover and simmer 10 minutes. Add tomatoes, stock, wine saffron, and parsley, cover, and simmer 20 minutes longer. Add fish, clams or mussels, and shrimp, cover, and cook 15 minutes. Season with salt and pepper.