Bouillabaisse is a traditional Provençal fish stew that originated in Marseille, but is also popular in Cannes. It is made with a variety of fish and shellfish, such as red mullet, sea bass, and prawns, cooked in a flavorful broth made with tomatoes, onions, garlic, and herbs. The dish is typically served with a side of rouille, a garlic and saffron-infused mayonnaise, and crusty bread. Bouillabaisse is a must-try dish for seafood lovers visiting Cannes, as it showcases the fresh and delicious flavors of the Mediterranean Sea.