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. 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 water between every 2-3 cuts to prevent sticking. (click for guide)
Plate the roll on your serving dish and top each piece with a blood orange slice. For best results remove the rinds of the slices before topping. (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!