Andale provides really great, really fast, cheap Mexican food. It's pretty much a counter topwhere you order food. If the weather is nice, eat at the tables just outside the building. If it isn't, eat in your office!
I first started going to Andale when I was sticking to low carbs, and I regularly got their "low carb burritos", made with lettuce (not rice) and a whole wheat tortilla. I can't speak to th authenticity, but they are very good.