Finely chop the cabbage.
Mince the onion and carrot.
Heat cooking oil in a pan and sauté the onion and carrot.
Add the cabbage and stir-fry together.
Drain the oil from the canned tuna and add it to the pan. Stir-fry.
Add the cooked rice and mix all the ingredients well.
Season with soy sauce and pepper.
Plate nicely.