I rarely go out to restaurants. I'm way too cheap. Though, I do enjoy Mexican.
Ian this place would be perfect for you if you were to go out. You can get a damn filling lunch (and all the chips and salsa you can stomach... good chips... good salsa) for less than 4 bucks. A "homemade" taco and a tamale will run you about 2.85 (plus tax) and will include all those chips.
But I have only seen maybe 2 pictures of you, but he sure did look like you; probably spent more money on his clothes though... give your frugality.