Ratatouille is a traditional Provençal dish from Nice, made with a variety of vegetables such as eggplant, zucchini, bell peppers, onions, and tomatoes. The vegetables are sautéed in olive oil and seasoned with herbs like thyme, rosemary, and bay leaves. Ratatouille can be served as a side dish or as a main course, and it is often enjoyed with crusty bread or over a bed of rice or pasta.