Finely chop the cabbage.
Drain the oil from the tuna and set it aside.
Add cooking oil to a pan and sauté the cabbage.
When the cabbage softens, add the tuna and stir-fry together.
Add the rice and mix well, stir-frying all the ingredients.
Season with soy sauce and black pepper to taste.
Transfer the finished cabbage tuna fried rice to a bowl.