beefburger

1889, hamburg steak, from the Ger. city of Hamburg, though no certain connection has ever been put forth, and there may not be one beyond that of Hamburg being a major port of departure for Ger. immigrants to U.S. Shortened form burger attested from 1939; beefburger was attempted 1940, in an attempt to make the main ingredient more explicit, after the -burger had taken on a life of its own as a suffix (cf. cheeseburger, first attested 1938).