Cut the cabbage in half and shred it finely. Mince the green onion.

Lay out one slice of pork belly, season with salt and pepper, and place 1/8 of the shredded cabbage on top. Roll the pork around the cabbage. Repeat for all 8 rolls.

Place the rolls on a microwave-safe plate, drizzle with sake, cover loosely with plastic wrap, and microwave at 600W for 3 minutes or until the pork is cooked through.

Mix the minced green onion with sugar, soy sauce, oyster sauce, and sesame oil in a bowl to make the sauce.