Fold your nori in half and crease it - this will help you tear the nori into 2 pieces. Lay your nori on the sushi mat, shiny side facing down.
Take approximately 1/2 cup of rice and with wet fingers (keep a bowl of water nearby for all sushi rolling), gently spread the rice over the nori. You don't need to leave a gap empty. Fill the whole sheet with rice.
Sprinkle some sesame seeds on the rice (optional but adds flavour and looks pretty!)
Pick up your nori and flip it over, so the rice is now touching the rolling mat and the seaweed side is facing up.
Add your ingredients. Line the ingredients in a neat row so there are no gaps. This will make sure every bite has every ingredient.
Slowly roll up the nori, applying gentle pressure with your finger tips to the bottom of the roll. Keep rolling until the whole thing is closed.
Use a really clean knife to slice it up. I would recommend washing your knife after every slice to make sure you get clean cuts.