Ribollita is a traditional Tuscan vegetable and bread soup. It is made with a variety of vegetables such as kale, cabbage, carrots, celery, and onions, cooked in a flavorful broth. Stale bread is added to the soup, which thickens it and gives it a hearty texture. Ribollita is often served with a drizzle of olive oil and grated Parmesan cheese on top.