Tacos al Pastor al Arabia al Kebab

Tacos al pastor are a Mexican classic street food.  Big piles of marinated pork are impaled on a vertical spit, topped with an entire pineapple, and the whole thing is slowly roasted, pineapple juices flowing down over the meat, mingling with melting fat, with bits constantly being shaved off of the outside to fill tacos for customers.  Yum.

If this sounds vaguely familiar, that's because it was only introduced to Mexico in the 1800's by Arab immigrants, who knew a similar dish called shawarma.  This, in turn, is apparently an adaptation of the earlier Turkish doner kebabs, which also inspired the Greek gyros.  In Armenia, this dish is called "tarna" ("it turns", akin to gyros (same root as gyroscope)).  Japan has started to adopt a version as street food, but being Japan, they put mayonnaise on it.  Sigh.  Frankly, the Wikipedia article on doner kebabs make it sound like this is the single most popular street food in the world.  Plausible, but I have to wonder if sausages aren't another possible contender.