Instructions:

1. Prepare the Spam:
   • In a small bowl, mix the soy sauce, sugar, and mirin (if using) until the sugar dissolves.
   • Heat a large skillet over medium heat and add the Spam slices.
   • Fry the Spam until both sides are lightly browned and crispy.
   • Pour the soy sauce mixture over the Spam slices in the skillet.
   • Let the Spam cook in the sauce for a few minutes, turning to coat each side, until the sauce thickens and caramelizes. Remove from heat.
2. Prepare the Rice:
   • While the Spam is cooking, prepare the sushi rice according to the package instructions.
   • If using furikake, mix it into the cooked rice for added flavor.
3. Assemble the Musubi:
   • Lay a piece of plastic wrap on a flat surface, or use a musubi mold if you have one.
   • Place a strip of nori, shiny side down, on the plastic wrap or in the mold.
   • Scoop about 1/4 to 1/3 cup of sushi rice onto the nori strip and press it down firmly.
   • Place a slice of Spam on top of the rice.
   • Add another scoop of rice on top of the Spam and press it down firmly, forming a compact block.
   • Wrap the nori around the rice and Spam, using a bit of water to seal the ends of the nori.
4. Serve:
   • Slice the Spam musubi in half if desired, and serve immediately.