Cut the salmon and tuna into bite-sized pieces.
Dice the cucumber, avocado, and red bell pepper.
Mix the sauce ingredients: soy sauce, sesame oil, lemon juice, and honey.
Place the prepared salmon, tuna, and vegetables on top of the rice.
Drizzle the prepared sauce over the top.
Finish by topping with seaweed flakes, sesame seeds, and chopped onion.