The main ingredient in traditional sushi is vinegared rice, known as "shari" or "sushi meshi." Sushi rice is typically short-grain and seasoned with a mixture of rice vinegar, sugar, and salt, giving it a subtly tangy flavor that complements various fillings and toppings. While sushi often includes raw fish or other proteins like shrimp, crab, or vegetables, it's the seasoned rice that defines sushi itself. This dish originated in Japan and has since evolved into numerous varieties, such as nigiri, maki, and sashimi, each showcasing the versatility of rice combined with fresh, high-quality ingredients.