Finely chop onion, pork, and green onion.
Heat oil in a pan and sauté the green onion to make green onion oil.
Add the pork and stir-fry.
Add the onion and sauté until it turns translucent.
Add the jajang sauce and mix well while simmering.
Add the rice and stir-fry evenly.
Serve on a plate to finish.