Rinse sushi rice under cold water until clear, then cook according to package instructions.
Once cooked, allow the rice to cool slightly.
Slice sashimi-grade fish into thin pieces.
Prepare vegetables by slicing avocado and julienning cucumber.
In a bowl, layer a generous amount of sushi rice.
Arrange sliced fish, avocado, and cucumber on top of the rice.
Add seaweed salad and a dollop of pickled ginger on the side.
Drizzle soy sauce over the top and sprinkle with sesame seeds.
Garnish with chopped green onions and serve with wasabi if desired.