Prepare tuna and eggs.
Beat the eggs in a bowl.
Heat sesame oil in a pan and sauté chopped onions.
Add tuna and continue sautéing together.
Add cooked white rice and stir-fry.
Pour in water or broth and bring to a boil.
Slowly pour in the beaten eggs while stirring.
Season with salt and pepper to taste.
Serve in a bowl and top with chopped green onions.