Ratatouille is a traditional French Provençal stewed vegetable dish originating from Nice, France. The dish is made of tomatoes, eggplants, zucchini, bell peppers, garlic, onions, and herbs. The word 'ratatouille' comes from the French verb 'touiller, ' which means to stir up. The Nicoise version of ratatouille includes olives, anchovies, and capers. It is usually served as a side dish or as a main course.