Quick answer: Sushi is any dish made with vinegared rice, with or without raw fish. Sashimi is thinly sliced raw fish or seafood served without rice. Nigiri is a type of sushi: a hand-pressed mound of rice topped with a slice of fish. So nigiri is sushi, but sashimi isn't. Are you new to sushi? If you are, it’s easy to get overwhelmed by the amount of new sushi-related Japanese terms and words. But not to worry – everyone starts somewhere! Let’s start with three of the most b