Once tabbed "Best Mexican Food in the Country" by the New York Times. You won't come here for the atmosphere. There is no sign on the building, and seating is first come-first served, but you'll be happy you stood in the long line forming outside the door once you taste what's served up here. Julia Child is said to have named this her favorite Mexican restaurant, but other, recent reviews call it pleasant but not extraordinary. Cash only. After you order, keep the tab with your order, and wait in the dining area for your number to be called.