Drain the oil from the canned tuna using a sieve.

Cut the onion into 6 pieces and chop the green onion. Heat 1 tbsp of cooking oil in a pan and stir-fry the onion and green onion over medium heat.

Once the onion and green onion are cooked, add the drained tuna and all the seasoning ingredients. Stir-fry over medium heat.

Slice the chili pepper and add it to the pan. Continue stir-frying over medium heat.