First up, add the sesame seeds to the rice and fold the rice again to mix them.
Lay one sheet of nori (shiny side down) on the bamboo mat. Then use the rice paddle/spatula to spread the rice evenly over the nori. You want it to cover a little less than half of the sheet (please see picture above), leaving a bit of space at the bottom of the nori.
Make sure to also fill in the left and right sides of the nori so that both ends of your sushi will hold up. I just use my other hand to help the rice to stay on top of the nori, preventing it from going off the nori sheet.
Arrange avocado slices, cucumber strips, and asparagus stalks horizontally across the center of the rice-covered nori sheet.Feel free to let the asparagus stick out on the left and right sides. They will give that restaurant-vibes to your asparagus! Using the bamboo mat, lift the edge closest to you with your thumbs while holding the fillings in place with your fingers. Roll the bamboo mat away from you, tightly wrapping the fillings in the nori and rice. Imagine you're giving your sushi a gentle massage to pack the ingredients in!
Once the roll is complete, dampen the top edge of the nori sheet with a bit of water to seal the roll. I just wet my fingers with some water and brush them across.
Then use the bamboo mat again to roll the sushi so it seals nicely.