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A hamburger sandwich. Photo by Len Rizzi, public domain in the US. Uploaded to Wikimedia Commons by User:VulcanOfWalden.

It is now a truly international phenomenon: Millions of people throw down patties of ground beef on a grill, cook to order, and slide the meat onto buns to make a sandwich. And the popularity of the hamburger shows no sign of dying out any time soon. But what is the history of this favorite sandwich? Where did it come from?

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