El Nopal is a Mexican restaurant in Cordova on Houston Levee Road just south of Highway 64 near the T.J. Mulligan's. I've been there before but not recently. I went to visit a friend that lives near there a few days ago and stopped to have lunch.
They have pretty standard Mexican fare and the do a good job. The food has always been good and the prices reasonable. I got a chicken Chimichanga and the total including a small queso was somewhere around $12 or $13 before tip. It's definitely somewhere I recommend if you're near there.