Dice the salmon and avocado into cubes.
Finely chop the onion, then soak it in cold water to remove the spiciness.
Mix soy sauce, lemon juice, sesame oil, sugar, and wasabi to make the sauce.
Place salmon, avocado, onion, cucumber, seaweed, and radish sprouts on top of the rice.
Drizzle the sauce and sprinkle toasted sesame seeds to finish.