01 - Rinse sushi rice thoroughly under cold water until the water remains clear. Combine rice and water in a medium saucepan or rice cooker, bring to a steady boil, then cover and reduce to a low simmer for 18 minutes. Remove from heat and let stand covered for 10 minutes to finish steaming.
02 - Mix rice vinegar, sugar, and salt in a small bowl until fully dissolved. Gently fold the seasoning mixture into the cooked rice, ensuring even distribution. Allow seasoned rice to cool to warm or room temperature.
03 - In a separate bowl, combine mayonnaise and sriracha until smooth. Set aside for finishing.
04 - Julienne cucumber and carrot, slice avocado evenly, finely chop green onions, and cut nori sheet into thin strips using a sharp knife.
05 - Divide seasoned sushi rice evenly among four bowls. Arrange imitation crab or shrimp, cucumber, avocado, carrot, green onions, and nori strips attractively atop each portion.
06 - Drizzle spicy mayo and unagi sauce over each bowl. Sprinkle tempura flakes and toasted sesame seeds generously on top.
07 - Serve immediately for optimal crunch and freshness.