My son and I are checking out NYU Sunday. We're rural New England chowhounds who ordinarily plan our sporadic visits to the city around restaurants (can't eat like this at home). The frustrating problem is that the college tour schedule gives us only between 11:30 a.m. and about 12:30 to find lunch, and we'll be gone by dinner. Any recommendations on a place right by NYU where we could eat something quick but interesting? Decor/"atmosphere" etc. are totally irrelevant in this instance, just good food we can squeeze in. Preference order probably goes Sushi, then Mexican, but ANYTHING that's very close to the square that seems interesting and quick enough would be appreciated. Thanks!