Cover the sheet of nori in a thin even layer of rice, filling all the way out to the edges. (click for guide)
Flip the sheet of nori over so the rice is face down on a bamboo rolling mat that is wrapped in plastic. (click for guide)
Arrange the fillings (imitation crab stick, avocado, and cucumber) in even lines, 1 inch from the edge along the longer side of the nori sheet. 1 + ½ of a crab stick should cover the whole length. Optionally, use your hands to shred the crab stick if desired (some brands shred more easily than others). (click for guide)
Spoon the umami salmon over the top of the roll as evenly as possible. (click for guide)
Place the plastic-wrapped rolling mat over the top of the roll and press the roll into a consistent shape. Be gentle with this step so you don't squeeze out the umami salmon. (click for guide)
Place the roll on a cutting board and grab your sharpest knife. Optionally, cover the roll with plastic cling wrap. Run the knife under water for a second, then shake off any excess. Cut the roll into 8 equal pieces using a gentile sawing motion with the knife, running the knife under the tap between every 2-3 cuts to prevent sticking. (click for guide)
Plate the roll on your serving dish and top with crispy onions. (click for guide)
Notes
If this is your first time making sushi be sure to check out the Sushi Beginner's Guide before getting started!