I'm catching up with an old friend and going to a show at Oberon in a couple weeks. Friend isn't a picky eater but is on a tight budget. I'm drawing a total blank in Porter, so thinking we'll stick to Harvard. Friend, who hasn't been to Cambridge since moving to Western MA last year, wants a uniquely Cambridge experience. I'm thinking an ethnic hole in the wall. Any thoughts? My gut reaction is Bon Chon, though it doesn't quite have the cozy catch-up ambiance we're striving for.