Cut cabbage, onion, and potato into bite-sized pieces.
Cut pork into bite-sized pieces.
Add cooking oil to a pan and stir-fry the pork.
When the pork is cooked, add the cabbage, onion, and potato, and stir-fry together.
Once the vegetables are softened, add the jajang sauce and mix well.
Pour in 100ml of water and simmer over medium-low heat for 5 minutes.
When the potatoes are cooked through, it's done. Plate and serve.