Cut the seaweed into shapes for Minions' eyes, mouth, and glasses.

Mix the cooked rice with boiled egg yolks and a pinch of salt.

Prepare the tuna filling by mixing tuna, mayonnaise, sesame seeds, pepper, and chopped onion.

Shape the rice into balls and flatten them slightly. Add the tuna filling inside and reshape them into balls.

Decorate the rice balls with seaweed to create Minions' glasses, eyes, and mouth.