Just English idiom. For a general description of the meal, you don't use the article. For a particular portion of the food, you do.
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kpripperWhy does the steak have an article, but the hamburger does notI don't see any reason for that. I think that the word "hamburger" should, indeed, be preceded by the article "a", since it is a countable noun.have?
kpripperGuy had hamburger.As ground beef, hamburger is a non-count noun.
kpripperAfter all, passengers on the train do not eat raw meat.Ground beef can be cooked. The cooked patty can be large or small, as prepared by the kitchen.