Shred the cabbage.
Slice the onion and thinly slice the carrot.
Heat olive oil in a pan and sauté the onion and carrot.
Add the shredded cabbage, sprinkle a little salt, and stir-fry together.
Drain the oil from the canned tuna and add it to the pan, stir-frying together.
Season with soy sauce and pepper.
Serve the stir-fried mixture without rice in a bowl and sprinkle with sesame seeds.