Cut the mackerel and chicken breast into bite-sized pieces.
Chop the onion, carrot, and green onion.
Add oil to a pan and stir-fry the onion, carrot, and green onion.
Add the mackerel and chicken breast and stir-fry them.
Add the rice and stir-fry together.
Season with soy sauce, salt, and pepper to taste.
When all the ingredients are evenly mixed and cooked, it's done.