Chop the onion and pork into small, bite-sized pieces.
In high heat, add oil, pork, black bean paste, soy sauce, garlic, and ginger. Saute and mix thoroughly for one minute.
Add the onion, mix thoroughly, and let cook for another minute.
Season with cooking wine and oyster sauce, and mix thoroughly.
Add water and sugar, then taste. If it needs more seasoning, add a little black bean paste and soy sauce.
Make a slurry by combining potato starch and water. Add the slurry to the sauce gradually while mixing until it thickens up.
Once the consistency is to your liking, serve with rice, fried egg, and egg soup. Splash of sesame oil on top and enjoy!