You’ve probably walked by Ennju a few times without realizing it. It’s on 17th Street (just east of Union Square), and it keeps a pretty low profile. But locals know about it, and you’ll find a line there at lunch. This place is a Japanese cafe where you grab something pre-made or order some noodles or a rice bowl at the counter. It’s extremely casual, you seat yourself, and, after 9pm, all the sushi is half-off. If you’re sushi-bargain hunting, this is the play.