Drain the oil from 2 cans of tuna using a sieve.

Finely chop 2 strips of bacon and 1/4 onion.

Cook the bacon in a dry pan over medium heat, then add the onion and sauté together.

Mix the drained tuna, sautéed bacon and onion, 4 tbsp mayonnaise, and a pinch of pepper in a bowl.

Mix 4 cups of cooked rice with 1 tbsp sesame seeds and 1 tbsp sesame oil.

Flatten the rice, place the tuna mixture in the center, and shape into balls or triangles.

Optional: Use a triangular mold to shape the onigiri.

Pan-fry the onigiri in a dry pan over medium-low heat until golden brown.