Drape the tuna slices over the top of the roll, adjust the angle so the tuna spans the entire length of the roll. (click for guide)
Place the plastic-wrapped rolling mat over the top of the roll and press the roll into a consistent shape. (click for guide)
Place the roll on a cutting board and grab your sharpest knife. Optionally, cover the roll with plastic cling wrap. Run the knife under water for a second, then shake off any excess. Cut the roll into 8 equal pieces using a gentile sawing motion with the knife, running the knife under the tap between every 2-3 cuts to prevent sticking. (click for guide)
Plate the roll on your serving dish. Drizzle or brush the yakiniku sauce over the tuna then top with green onion. (click for guide)
Notes
If this is your first time making sushi be sure to check out the Sushi Beginner's Guide before getting started!