You need to start by cooking sushi rice and if you are a newbie there’s nothing to worry about because I have explained the step-by-step instructions to cook and season sushi rice here.
Prepare fillings by cutting the cucumber into thin strips. Also, cut the avocado into equal halves and make thin slices. Gather all other items needed for making a sushi roll
Lay the bamboo mat on the plain working surface and cover it with a plastic sheet. Now place one Nori sheet on the bamboo mat, shiny side facing downwards.
Dampen your fingers, take a medium ball of sushi rice and spread it out on the nori sheet to make an even layer. Leave about ¾ inch on the top.
Arrange four cucumber strips and four Oshinko strips over the sushi rice. Add two slices of avocado and sprinkle some sesame seeds over it.
Lift the sushi mat from your side and start rolling working from bottom to the top. When you reach at the end, seal the edges with some water or rice grains.
Continue the above steps to make more sushi rolls using the remaining ingredients. Then take a sharp sushi knife to cut the roll into equal pieces. Serve in a plate with soy sauce and wasabi.