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Bouillabaisse is a traditional Provençal fish soup originating in the port city of Marseille. The word is originally a compound of the two Provençal verbs bolhir and abaissar. Bouillabaisse was originally a dish made by Marseille fishermen, using bony rockfish, which they were unable to sell to restaurants or markets. There are at least three kinds of fish in a traditional bouillabaisse: typically red rascasse; sea robin; and European conger. It can also include gilt-head bream, turbot, monkfish, mullet, or European hake. It usually also includes shellfish and other seafood such as sea urchins, mussels, velvet crabs, spider crabs, or octopus. More expensive versions may add langoustine, though this was not part of the traditional dish made by Marseille fishermen. Vegetables such as leeks, onions, tomatoes, celery, and potatoes are simmered together with the broth and served with the fish. The broth is traditionally served with rouille, a mayonnaise made of olive oil, garlic, saffron, and cayenne pepper, on grilled slices of bread. What makes a bouillabaisse different from other fish soups is the selection of Provençal herbs and spices in the broth; the use of bony local Mediterranean fish; the way the fish are added one at a time, and brought to a boil; and the method of serving. In Marseille, the broth is served first in a soup plate with slices of bread and rouille, then the fish is served separately on a large platter ; or, more simply, as Julia Child suggests, the fish and broth are brought to the table separately and served together in large soup plates.