Remove excess moisture from the tofu with a kitchen towel and crumble it finely.
Finely chop the onion, carrot, and green onion.
Add sesame oil to a pan and sauté the onion and carrot.
Add tuna (drained of oil) and stir-fry together.
Add the tofu and cook until the moisture evaporates.
Add rice and stir-fry, mixing all the ingredients evenly.
Season with soy sauce, salt, and pepper to taste.
Add green onions and finish by stir-frying briefly.