Anna's Taqueria (http://www.annastaqueria.com/locations.htm). They have six locations in Boston, Brookline and Cambridge-Somerville making them among the easiest things to find. Pretty standard taqueria fare, wraps and platters made to order in about 30 seconds. Not everyone's impressed by their authenticity, but relative to Boston they score pretty well. Plus, they make a mean lengua quesadilla for $4, and I like their horchata.