Cook the rice so that it's fluffy and not too sticky.
Drain the oil from the tuna using a strainer.
Mix the tuna with mayonnaise, salt, and pepper.
Add a little salt and sesame oil to the rice, mix well, and let it cool.
Take a bite-sized portion of rice and flatten it.
Place the tuna filling in the center and wrap it with rice.
Shape the rice balls into triangles or circles.
Cut the seaweed and wrap it around the rice balls.