If you're tired of the same old burger or chicken sandwich, then the breaded pork tenderloin sandwich ($4.95) at Heights Camphouse BBQ (2820 White Oak Drive, 713-861-2033) may be exactly what you're looking for. "It's a Northern thing," says the manager, describing all the Yanks who flock to this sandwich shrine. A thick slice of pork tenderloin is pounded thin, coated with a light layer of seasoned breading, then pan-fried. It comes sandwiched between a soft roll slathered with just enough mayo to coat the shredded lettuce and tomato slices. An order of beer- battered onion rings ($2.55) on the side is the perfect accompaniment to this Northern specialty.