Ratatouille is a basic vegetable dish from the southern region of France, particularly Nice. It contains eggplant, tomatoes, zucchini, onions, peppers, and garlic. Each vegetable is first cooked separately and then they come together to a smooth a soft texture. Some elements can vary, including adding vegetables (such as mushrooms here) or various aromatic elements (such as olives). It is delicious on pizza.