Slice cabbage, onion, and carrot into bite-sized pieces.
Heat cooking oil in a pan and stir-fry the pork.
Once the pork is cooked, add the chopped vegetables and stir-fry together.
When the vegetables are softened, season with soy sauce and oyster sauce.
Add water and potato starch to thicken the mixture.
Finish by pouring the cooked Jjajang sauce over the rice.