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. After slicing, use the rolling mat again to press the pieces back into shape. (click for guide)