Cut the salmon and tuna into bite-sized cubes.
Slice vegetables such as onion, avocado, and cucumber into bite-sized pieces.
Make a sauce with soy sauce, sesame oil, lemon juice, sugar, and minced garlic.
Place the prepared ingredients on top of the rice.
Drizzle the sauce evenly over everything.
Finish by adding toppings such as seaweed and sesame seeds.