Sushi rolls are a popular Japanese dish made by wrapping rice and various fillings in seaweed, known as nori. The rice is usually seasoned with vinegar, giving it a slightly tangy flavor. Common fillings include fresh fish like salmon or tuna, vegetables like cucumber and avocado, and sometimes even cooked ingredients like shrimp or tempura. These rolls come in many varieties, such as maki, which are rolled and sliced into bite-sized pieces, and uramaki, where the rice is on the outside. Sushi rolls are often served with soy sauce, wasabi, and pickled ginger for added flavor, making them a delightful treat for many.