What food is Frankfurt famous for?

Green sauce. with hard-boiled eggs and boiled potatoes.
Frankfurter sausages. with bread and mustard.
Handkäs' with music. with bread and butter.
Frankfurt loin ribs. with sauerkraut and bread.
Sweets and Cake. Everything one dreams of ...
Recipes.

Do I need cash in Frankfurt?

One cash and one EC card payment were made. Sure, often you CAN use a credit card, but Germans just don't. The result is that many places don't take them, and certainly when you are buying something like a gelato or a currywurst, cash is the norm and often the only option.

Is Frankfurt known for hotdogs?

Two European cities claim to be the birthplace of the sausage: Frankfurt, Germany, whence the byname frankfurter, and Vienna, Austria, whence the byname wiener.