Dice the tofu into small cubes and remove excess moisture.
Finely chop the onion and green onion.
Heat cooking oil in a pan and sauté the onion and green onion.
Drain the oil from the canned tuna and add it to the pan, stir-frying together.
Add the tofu and stir-fry, lightly mashing it as you go.
Add the cooked rice and mix everything evenly while stir-frying.
Season with soy sauce, salt, and pepper.
Transfer the finished fried rice to a serving bowl.