Tripas à Moda do Porto, also known as Porto-style tripe, is a traditional dish that dates back to the 14th century. It is made with tripe (the lining of a cow's stomach), white beans, various meats (such as pork, beef, and sausage), and vegetables. The dish is slow-cooked for several hours to develop its rich flavors. It is considered a symbol of Porto's gastronomy and is often enjoyed during festivals and special occasions.