Eventually the Mongolian army made its way to Russia where they adapted the concept into a steak tartar (pictured below).
Today's concept of a hamburger didn't develop until the early 19th century. As you probably guessed, our most favorite food gets its name from the city of Hamburg, Germany. I wonder if I could get away with calling someone from Hamburg a hamburger... That would be sweet.
The hamburger of today was served to immigrants at Ellis Island. It was quick, cheap, and provided the travelers with critical nutrients and protein.