Another vote for Tortas Frontera food quality. It is rather cramped in the back, but the tables turn pretty quickly, as does the bar, which has some good tequila. I ordered off the website, and it was ready very quickly. Only problem was I ordered from the Terminal 3 location instead of Terminal 1, so I had a rather longer wait than expected. I had to call Terminal 3 to tell them to switch the order to the proper location. Apparently this happens all the time, especially to SFO-based people who're used to always flying out of Terminal 3 at SFO, and don't really think about where they are (and may or may not have been drinking in the United Club). So make sure your order is for Terminal 1!