The main ingredient in a traditional French ratatouille is eggplant, which is often complemented by a variety of other vegetables such as zucchini, bell peppers, tomatoes, onions, and herbs like basil and thyme. Ratatouille is a classic Provençal dish, renowned for its vibrant colors and flavors, as well as its emphasis on seasonal produce. The vegetables are typically sautéed or stewed together, allowing the flavors to meld harmoniously. Ratatouille can be enjoyed as an accompaniment, a main dish, or even served cold, showcasing the culinary tradition of highlighting fresh ingredients in French cuisine.