Here's a handy recommendation to keep in your back pocket, whenever you're near Union Square and its endless mediocre food options or trying to grab a bite before a show at A.C.T.: Katana Ya is just about perfect. You might have to wait, because this place is no secret to locals. But turnover is quick. Choose from soy, miso, or salt broth, and a few varieties of ramen (fried chicken is always a good choice).