Katana is one of those sushi restaurants where the plates float through the dining room on a little stream. Different color plates cost different amounts, starting at just $1.50 each, and if you see something you like, you simply just reach out and grab it. Since this little spot in North Beach doesn’t take reservations and makes surprisingly good sushi, there’s usually a wait. Grab a ticket when you walk in and pay attention because they’ll skip you if you don’t respond.