The primary ingredient used in traditional sushi is vinegared rice, known as "shari" or "sushi-meshi." This rice is prepared by cooking short-grain rice and seasoning it with a mixture of rice vinegar, sugar, and salt. The preparation of sushi rice is crucial as it provides the foundation for various types of sushi, including nigiri, maki, and sashimi. While sushi may also include a variety of fillings and toppings such as fish, vegetables, or seaweed, the seasoned rice is the defining characteristic of sushi. Overall, the balance of flavors and texture of the rice plays an essential role in the overall experience of enjoying sushi.