This what a California Roll is. it is not sushi in the sense that there is no raw fishin it...
If you are going to introduce someone to sushi, this is the way to do it. A California roll contains crab meat, avocado, and cucumber. Spread about a cup of rice on the sheet of nori, leaving about an inch of uncovered nori at one side. Do not pack the rice, rolling will take care of that. The rice should be less than a 1/4 inch thick -- you should be able to see nori through the rice. The biggest mistake is using too much rice.
Put avocado slices on top of the rice first, one slice thick, near the edge of the rice, the edge opposite the uncovered nori. Unwrap and split a piece of imitation crab meat lengthwise into two pieces. Place the two pieces end to end on top of the avocado. Then add several strips of cucumber next to the crab and on top of the avocado. (If you put the avocado on last, it is a lot messier to roll.)