Tear or cut the nori sheet in half: Fold the nori sheet in half and gently tear along the seam. If it does not tear easily, use kitchen shears to cut the nori sheet in half
Cut the avocado and cucumber: Slice the avocado in half the long way. Remove the seed and cut each half into 8 slices. Each whole avocado should yield around 16 slices. You can also drizzle a little lemon juice over your cut avocado to prevent it from browning in your roll. Finally, cut the cucumbers into strips that are as long as your nori sheet and about 1/8 inch thick. Prepare your bamboo sushi mat: Cover your bamboo sushi mat with plastic wrap. This will help keep the rice from sticking to it.
Press rice onto nori sheets: Next, place the nori sheet onto the plastic wrap with the shiny side facing down. Then press around 1/2 cup of rice onto the nori sheet in an even layer. Tip: Combine a bowl of water and a splash of rice vinegar and use to wet your hands prior to handling the sushi rice. This will prevent the rice from sticking to your hands.
Add sesame seeds to the rice: Evenly sprinkle sesame seeds on your sushi rice.
Flip nori sheet over: Gently flip the nori sheet over so the rice is facing down. You will add the filling directly to the nori sheet with the rice on the outside.
Add the avocado and cucumber: Add the avocado slices and cucumber sticks horizontally along the nori sheet. In general, I add 2-3 avocado slices and 1-2 cucumber sticks depending on the size of each ingredient and how everything fits.
Add the crab: Spoon about 1/4 of the crab salad mixture onto the nori sheet and spread evenly across the middle of the sheet.
Roll the sushi: Use the bamboo sushi mat to fold your roll until it's completely enclosed. Once the rice is making contact with the nori roll, pull back the sushi mat so it doesn't get caught in the sushi. Still using the sushi mat as your guide, finish rolling until the roll is completely wrapped. Then wrap the sushi mat around the roll and gently press, tightening the roll together.Keep in mind that rolling sushi is an art that may take some practice so don’t get frustrated if it doesn’t look perfect your first time. It will get easier the more you do it. If you struggle, you can try using less crab filling or using 3/4 or a full nori sheet. Cut the roll: Using a sharp knife, cut the roll into 8 pieces. I do this by first cutting the roll in half. Then cutting each half in half. Then cutting each fourth in half. Tip: Be sure to clean and wet the edge of your knife before cutting each roll.
Serve and enjoy: I usually serve with soy sauce and wasabi. Sushi rolls are traditionally served with pickled ginger as well.