I'd heard about La Familia Meat Market (on Canal, just off Navigation in Houston) before, but yesterday was my first time to try it out. I bought 2lbs of their marinated fajita meat (beef), and grilled it over an open flame for just a few minutes per side, flipping often.
Holy shit was that good. Next time I want to try the chicken, but it'll be difficult to pass up the beef. Definitely worth trying out.