Sushi is one of the most characteristic dishes of Japanese cuisine. It is made of lightly vinegared rice and combined with fresh seasonal ingredients ranging from seafood to vegetables, mushrooms, eggs, and meat which may be raw, cooked, blanched or marinated. Sushi is best eaten with the hands. Sushi, a healthy food, is experiencing a wave of popularity the world over as the number of sushi restaurants mushrooms. Sushi originates from the practice of preserving salted fish by fermenting it in rice for months, a tradition which can be traced back to ancient Japan. In the past sushi was expensive and beyond the reach of commoners. Though the image of sushi as a luxury persists, the advent of kaiten (rotating) sushi restaurants and sushi-making robots means the price of sushi has become much more affordable.