01 - Rinse sushi rice under cold water until the water runs clear. In a medium saucepan or rice cooker, combine rice and water, bring to a boil, then cover and simmer on low for 18 minutes. Remove from heat and let stand, covered, for 10 minutes.
02 - In a small bowl, mix rice vinegar, sugar, and salt until fully dissolved. Gently fold the vinegar mixture into the cooked rice using a wooden paddle or spoon. Allow the rice to cool to warm or room temperature.
03 - In a separate bowl, blend mayonnaise and sriracha until smooth. Set aside for drizzling.
04 - Julienne cucumber and carrot, slice avocado, thinly slice green onions, and cut the nori sheet into strips. If needed, chop crab sticks or cooked shrimp into bite-sized pieces.
05 - Divide seasoned sushi rice evenly among four individual serving bowls. Arrange imitation crab or shrimp, cucumber, avocado, carrot, green onions, and nori strips on top of the rice in each bowl.
06 - Drizzle each bowl with spicy mayo and unagi or teriyaki sauce. Sprinkle generously with tempura flakes and toasted sesame seeds.
07 - Serve the assembled bowls at once to maintain optimal crunch and freshness.