Lampredotto is a traditional street food in Florence. It is a sandwich made with the fourth stomach of a cow, known as the 'lampredotto.' The stomach is boiled in a flavorful broth until tender, then thinly sliced and served on a crusty roll. Lampredotto is typically topped with a green sauce made from parsley, garlic, and anchovies, as well as a spicy red sauce. It is a unique and flavorful sandwich that is beloved by locals and visitors alike.