Nigirizushi: This is a popular sushi, wherein the rice is rolled into small oblong balls, and is served with wasabi root (a thick green root of the wasabi plant that tastes like horseradish) and toppings; which are usually thin slices of fish, like tuna and salmon. In some types of nigirizushi, the rice and toppings are bound by a thin strip of seaweed, known as nori. This is mainly seen in nigirizushi with toppings, like octopus, sweet egg, squid, and freshwater eel.