Shred the cabbage.
Thinly slice the onion and carrot.
Heat cooking oil in a pan and stir-fry the onion and carrot.
Add the cabbage and stir-fry until it softens.
Drain the oil from the canned tuna and add it to the pan, stir-frying together.
Season with soy sauce and black pepper.
Finish by sprinkling sesame seeds on top.