This classic veggie ratatouille recipe is a delicious and easy way to enjoy a variety of vegetables. Made with eggplant, zucchini, bell peppers, tomatoes, and onions, this dish is bursting with flavors. The vegetables are sautéed until tender and then simmered in a rich tomato sauce. Serve it as a side dish or as a main course with crusty bread or over rice. It's a perfect dish for a quick weeknight dinner or for entertaining guests.