Hamburger can also refer to the meat itself. This type of meat can be used in boxed dinners such as "Hamburger Helper". Hamburger is actually a distinct product from ground round and other types of ground meat. However, ground beef of any form is often commonly referred to as "hamburger." A recipe calling for 'hamburger' (the non-countable noun) would require ground beef or beef substitute- not a whole sandwich.

Etymology and history

Precursors and origins