Sushi is a traditional Japanese dish made with vinegared rice, typically seasoned with sugar and salt, and combined with a variety of ingredients, such as seafood, vegetables, or meat: raw seafood is the most common, although some may be cooked. While sushi comes in numerous styles and presentation, the defining component is the vinegared rice, also known as shari, or sumeshi. The modern form of sushi is believed to have been created by Hanaya Yohei, who invented nigiri-zushi, the most commonly recognized type today. This innovation occurred around 1824 in the Edo period. Sushi is traditionally made with medium-grain white rice and seafood, such as squid, eel, yellowtail, salmon, tuna or imitation crab meat. Certain types of sushi are vegetarian. It is often served with pickled ginger, wasabi, and soy sauce.
Learn more on Wikipedia