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When all the other ingredients are ready, remove the rice from the rice cooker. While the rice is still hot, add the sesame oil and salt. Mix well by lightly folding with a rice paddle or large spoon until evenly seasoned. The rice will cool down during this process and be ready to be used.
Put a sheet of gim, shiny side down with the longer side toward you, on a cutting board or a bamboo mat if available. Spread about 3/4 of rice evenly over the gim using a rice paddle or preferably your fingers.
Lift the entire bottom edge with both hands, and roll over the filling away from you, bringing it to the other end of rice and tucking in the filling with your fingers. Put firm pressure over the roll with the help of the bamboo mat, if using, to close everything in tightly. Then, continue to roll again, putting pressure evenly over the roll using both hands.
Rub or brush the roll with a little bit of sesame oil for extra flavor and a shiny look. Apply a little bit of sesame oil to a sharp knife. This will keep rice from sticking to the knife. Repeat as necessary after each cut. Wipe the knife with a damp towel if the rice still sticks. Cut the roll into 1/2-inch bite sizes.