Prepare the hand water by combining the water and rice vinegar in a medium size bowl.
Place the bamboo mat on your work surface with the sticks running horizontally.
Put the nori sheet on top with the rough side facing up.
Lightly moisten the palm of one hand with hand water and rub your hands together to prevent the rice from sticking to them.
Take a large handful of rice and place it center of the nori sheet. Use your hands to spread the rice evenly over the sheet. Be careful not to compress the rice too much and use the hand water often to keep your hands moist.
Sprinkle sesame seeds onto the rice.
Flip the nori sheet over so the rice is face down.
Place the sliced salmon and avocado into the center of the nori
Put your hands on the sides of the mat and start to roll.
Once you get to the end hold firmly to tighten the roll.
Place the finished roll on a wooden board.
Place the tip of your knife in the hand water and lift to wet the whole surface of the blade.
Slice the roll in half, smoothly and quickly. Then cut each half in half again two more times to get 8 even slices.
Remove any rice that starts to stick to the knife and re-moisten regularly as you do this.
Serve with soy sauce and sushi ginger.