“Nigiri consists of a mound of vinegared rice topped with a dab of hot horseradish wasabi and a slab of fish, crab, egg, or other topping. A small, thin bamboo mat is used to roll maki, a cylinder of rice wrapped in nori seaweed with a morsel of fish or other filling in the middle.”
Read more at http://www.inquisitr.com/1241805/sushi-has-many-health-benefits-and-risks/#xe4zgCLtHExowDTd.99