Add black pepper, sugar, cooking wine, soy sauce, green and minced garlic into a bowl and mix thoroughly.
Then add the marinade and the roughly chopped sweet onions to the sliced pork.
Let the meat marinate at least for 1 hour. I prefer 2-3 hours if possible.
Add some cooking oil to a large frying pan and pre-heat.
Then add the pork and all of its marinade. Cook on medium heat until meat is almost done and the liquid has evaporated. Depending on how much meat you cook, this could take anywhere between 10-15 minutes.
Once you see all of the liquid evaporated, turn the heat to high so the meat gets a nice char on the outside.
Optional but highly recommended: Garnish with sesame seeds.
Serve with steamed rice.