Article: To create the tuna rolls, you'll need a bamboo sushi mat. Set the mat out on your work surface with the slats running horizontally and cover it with a piece of plastic wrap. Next, lay half a sheet of nori on top of the plastic wrap on the mat.  Nori is an edible seaweed used to make sushi rolls. You can usually purchase it at Asian grocery stores and in the international foods aisle of some general markets. When you cut the sheet of nori in half, slice it horizontally. Make sure that the shiny side of the nori is facing down when you place it on the mat. Use your hands to carefully hold the rice in place as you flip it over. Make sure to line up the edge of the nori with the bottom edge of the bamboo mat.
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Place the nori on a bamboo mat. Turn the nori over so the rice is facing down.