Sushi is the most famous Japanese dish worldwide and is enjoyed both in Japan and internationally. There are many varieties of sushi including nigiri, maki rolls, temaki hand rolls, and gunkan battleship sushi. Some types of sushi contain raw fish like tuna or seafood and can be very healthy, though some varieties like fugu pufferfish need to be prepared extremely carefully as the fish contains a lethal poison. Japan has a long tradition of skillful sushi preparation.