Xi'an, Shaanxi, China
'Burgers' in Xi'anA most delicious snack, and a street food you must try when you're in Xi'an, this is probably the oldest burger you'll ever encounter (it dates back to the Qin dynasty).
Roujiaomo is a sandwich of savory meat (usually pork, though beef or lamb in the Muslim Quarters) that is normally topped with shredded lettuce and cilantro and laden with the taste of cumin and a collection of other pungent spices. The bread, or mo, has a crispy texture with a doughy center.
One bite of this, and you'll be sold.