Cut the salmon into bite-sized cubes.
Cut cucumber, avocado, onion, and other vegetables into small pieces suitable for eating.
Place rice in a bowl.
Top the rice with the prepared salmon, vegetables, seaweed, edamame, etc.
Mix soy sauce, sesame oil, and lemon juice to make a sauce.
Drizzle the sauce evenly over the ingredients.
Add sesame seeds, wasabi, mayonnaise, or other toppings as desired.