Holy crap that sounds good!
In europe they've got something called Kebab which I'm not sure is correct but that's what they call it. Flat bread (round) cut in half so it's semi round and then sliced open. They have this meat that rotates vertically on a stick and they slice pieces off it and then put it in the bread with sauces and stuff in it. However, this Spanish guy used pork from the neck which is much juicier. Note, I think the pork is better in Europe and the beef better in the US. Anyway, he did this with some kind of yoghurt and garlic sauce and this thing was incredible.
If I ever went back I'd try to find his a$$. It was amazing.