Rinse the rice under cold water until clear and remove excess starch. Combine rinsed rice with water in a saucepan. Boil, cover, and simmer for 15 minutes.

Turn off the heat and let the covered rice sit for an additional 10 minutes.

Mix vinegar, sugar, and salt in a bowl until dissolved. Gently fold into the warm rice.

Prepare your toppings: Julienne carrot, slice cucumber, and chop imitation crab. Slice avocado just before assembly.

Assemble bowls: divide seasoned rice among bowls, layer on all toppings, and sprinkle with sesame seeds.

For a creamy and spicy kick, mix mayonnaise with Sriracha and drizzle over the bowls.

Serve immediately with chopsticks or spoons.