New York may have a lock on the Chinese/Cuban restaurant thing, but Houston is leading in the Vietnamese/Mexican category. Well, actually, Matt's Fast Foods on 43rd Street may be the only Vietnamese/ Mexican restaurant, here or anywhere. There's a golden Buddha near the front door and a painting of a matador on the back wall. The word pho appears on one window, and a picture of a bowl of menudo is hand-painted on another. The neon sign in the window says, "Vietnamese & Mexican food," but there's no high-concept fusion going on here. It's just a little fast-food joint that features tacos and enchiladas on one side of the menu and Vietnamese vermicelli dishes, phos and stir-fries on the other. What else would you expect from an Asian man and a Mexican woman who got married and settled down to cook happily ever after in a Houston strip center?