Mian, a California-based chain, is run by Tony Xu, the chef behind the wildly popular Chengdu Taste restaurants. In this case, Mian opened in the space vacated by Chengdu Taste on the first floor of the 808 Center. (That restaurant, which specializes in the Sichuan dishes of its namesake city, is moving to a larger space on the second floor. It’s slated to open next month.) The same people who ran Chengdu Taste are now operating Mian.