Cut the Spam into 4 equal pieces.

Mix soy sauce, mirin, water, sugar, and ginger powder to create the teriyaki sauce.

Pan-fry the Spam slices on both sides until golden.

Pour the teriyaki sauce over the Spam and simmer until the sauce is absorbed.

Season the cooked rice with sesame oil and salt, mixing well.

Cut the nori seaweed into 4 long strips.

Line the Spam can with plastic wrap.

Add a layer of seasoned rice into the Spam can and press firmly.

Place a slice of teriyaki Spam on top of the rice.

Lift the plastic wrap to remove the musubi from the Spam can.

Wrap the musubi with a strip of nori seaweed.

Wrap the musubi tightly with plastic wrap to secure the shape.