Frankfurter, also known as Frankfurt sausage, is a classic hot dog that originated in Frankfurt, Germany. These sausages are made from finely ground pork, beef, or a combination of both, and are lightly smoked. They are usually served in a long, soft bun and topped with mustard, ketchup, sauerkraut, or onions. Frankfurters are a popular choice for hot dog lovers in Munich.