something about burger

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Fellas, do you know what exactly burger is?? We all knew that Mc.Donald sells cheese burger, beef burger, and many kinds of burgers..but what is it? I know that sandwich is actually a name of a prince, that is Earl of Sandwich and he addicted to play cards so he just wanted to make his meals easy and told his servant to add bread with cheese, eggs and so on. But I never found someone or something called 'burger' before. So, anyone knows about the root of this junk food name?