[Flickr: mattface]

Leftover pizza dough? Check. Leftover ground meat, cheese, and onions? Check. Roll out dough, layer with cheese, sautéed onions, and cooked burger patty, fold it up, bake, and you've got a Burger Bubble as described by Livejournal user randomorbit. Sounds like a nice pocket of meat, cheese, and onion.