Combine the marinade ingredients and marinate for at least 15 minutes.
Crisp up the slices in a frying pan.
Lay a strip of nori down. I like to make the width slightly smaller than the mold. I.e., if your mould is 3” long, make the nori strip about 2” wide and ~6” long. Long enough to wrap around the rice and spam, then place your musubi mould down and put a small scoop of rice in the mould, pressing down.
Top with a slice of the spam.
Remove the mould and fold the nori sheet around, wetting the end of the nori to make it stick.