01 - Place sushi rice in a fine-mesh strainer and rinse under cold running water, gently swirling with your hand, until the water runs completely clear. Drain thoroughly.
02 - Transfer the rinsed rice and 2 cups of water to a medium saucepan. Bring to a rolling boil over medium-high heat, then cover tightly with a lid, reduce heat to low, and simmer for 15 minutes. Remove from heat and let rest, covered, for 10 minutes without lifting the lid.
03 - While the rice rests, whisk together rice vinegar, sugar, and salt in a small bowl until fully dissolved. Transfer the warm rice to a large mixing bowl, pour the vinegar mixture over it, and gently fold with a rice paddle using slicing motions. Fan the rice briefly to cool and achieve a glossy finish.
04 - Shred the imitation crab sticks into thin pieces. Dice the avocado, julienne the cucumber into matchstick strips, slice the nori sheets into thin strips, and finely chop the pickled ginger and green onion.
05 - In a small bowl, whisk together the mayonnaise and sriracha until smooth and well combined. Adjust the sriracha quantity to your preferred spice level.
06 - Divide the seasoned sushi rice evenly among four serving bowls. Arrange the shredded crab, diced avocado, julienned cucumber, nori strips, and chopped pickled ginger in sections over the rice in each bowl.
07 - Drizzle each bowl with spicy mayo and soy sauce. Sprinkle generously with toasted sesame seeds and thinly sliced green onion. Serve immediately with additional soy sauce on the side.