01 - Rinse the sushi rice under cold water until the water runs completely clear. Drain thoroughly to remove excess starch.
02 - Combine the rinsed rice and water in a medium saucepan. Bring to a boil over medium-high heat, then cover tightly, reduce heat to low, and simmer for 15 minutes. Remove from heat and let sit, covered, for 10 minutes to allow the grains to finish steaming.
03 - While the rice rests, whisk together the rice vinegar, sugar, and salt in a small bowl until fully dissolved. Gently fold the seasoned vinegar into the warm rice using a folding motion, being careful not to crush the grains. Allow the rice to cool slightly.
04 - Shred the imitation crab sticks into thin pieces. Dice the avocado, julienne the cucumber into matchstick-sized strips, slice the nori sheets into thin strips, and finely chop the green onion and pickled ginger.
05 - In a small bowl, stir together the mayonnaise and sriracha until smooth and well combined. Adjust the sriracha quantity to your preferred spice level.
06 - Divide the seasoned rice evenly among four serving bowls. Arrange the shredded crab, diced avocado, julienned cucumber, nori strips, and chopped pickled ginger on top of the rice in separate sections.
07 - Drizzle each bowl with the spicy mayo and soy sauce. Sprinkle generously with toasted sesame seeds and thinly sliced green onions. Serve immediately with additional soy sauce on the side.