Unroll, then roll again towards the exposed end of the seaweed sheet to make a long roll. Cover, reduce heat to low and simmer for 20 minutes, or until rice is tender and water has been absorbed. Remove from the heat and stir in the vinegar and a pinch of salt. Lift the mat and roll over the vegetables once and press down. Place a sheet of seaweed over the plastic. You may moisten with a little water to help seal. .
Serve cut side up with your favorite sushi condiments. Arrange strips of cucumber and avocado across the center of the rice. Set aside and continue with remaining nori sheets, rice and fillings. . .
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