Actually it is in Seatauket, but you won’t notice that you have crossed any boundary.  It’s called Sushi Ichi.

photo-sushi

Go there for lunch.  Tell them how much you want to spend and what kind of -tarian you are. Then ask them to prepare whatever is best to fit those constraints.  You won’t be disappointed. It doesn’t hurt that there is a fishmonger right next door.

photo-ichi