Cut tuna or salmon into small cubes.
Slice avocado, cucumber, carrot, and other vegetables into bite-sized pieces.
Place rice in a bowl.
Top the rice with fish, vegetables, seaweed, and radish sprouts.
Mix soy sauce, sesame oil, and lemon juice to make the sauce.
Drizzle the sauce evenly on top.
Sprinkle sesame seeds to finish.