Today many people associate Hamburgers as a quintessential identifier of American cuisine. While there is no question that America is responsible for its popularity during the mid 20th century, its organs can actually be traced back to the Roman Empire.
Known as an Isicia Omentata, a Roman dish that contained ground meat pine nuts, pepper, and flavored with wine and garum. A great write up about the history of the burger can be found in this Food & Wine Article.
So the next time you bite down on that juicy, tender, burger just remember that it has a very long and fascinating history behind it.