Ribollita is a traditional Tuscan soup that is made with vegetables, beans, and stale bread. The soup is typically made by simmering a mixture of onions, carrots, celery, kale, and cannellini beans in a flavorful broth. Stale bread is then added to the soup, which helps to thicken it and give it a hearty texture. Ribollita is a comforting and nutritious dish that is perfect for cold winter days.