Rinse the sushi rice under cold water until the water runs clear and soak for 30 minutes.

Cook the rice according to package instructions and let it cool slightly.

Combine rice vinegar, sugar, and salt in a small saucepan and heat until dissolved, then mix with the cooled rice.

Place a sheet of plastic wrap on a bamboo sushi mat (or a clean cutting board) and lay a sheet of nori on top, shiny side down.

Wet your hands and spread a thin layer of sushi rice over the nori, leaving about an inch at the top edge.

Lay a few strips of cucumber, avocado, and imitation crab along the center of the rice-covered nori.

Start rolling the sushi away from you, using the bamboo mat to guide the roll. Roll tightly but not too tight to avoid squeezing out fillings.

Once rolled, use a sharp knife to slice the roll into bite-sized pieces. Clean the knife between cuts for clean edges.

Arrange the slices on a plate and serve with soy sauce, wasabi, and pickled ginger on the side.