Wash the cabbage thoroughly and shred it.
Slice the carrot and onion thinly as well.
Heat olive oil in a pan and sauté the onion.
When the onion becomes translucent, add the carrot and cabbage and continue stir-frying.
Once the vegetables are softened, add the tuna and season with salt and pepper.
When all the ingredients are cooked, turn off the heat and drizzle with sesame oil.
Serve on a plate to finish.