In a large mixing bowl, add the cooked rice, drained canned tuna, mayonnaise, sesame oil, and seaweed. Use a spatula to mix the ingredients together well, ensuring even distribution of flavors.

Once everything is well combined, flatten the mixture in the bowl to create an even surface. Using a knife, divide the mixture into 8 equal portions.

With clean hands, take each portion and roll it into a tightly packed ball.

The Tuna Rice Balls are best served fresh on a platter with soy sauce or pickled vegetables.