Combine ingredients 1 to 5 plus 1/2 cup of water in a bowl. Stir everything together. Add the pork slices and onion rings to marinate. Cover the bowl to marinate for 2-3 hours, overnight or 2-3 days in the fridge.
When ready to cook, set aside the onions then put the marinated pork(with the marinade) in a non-stick pan with the 1/2 cup of water.
Cover the pan. Let this steam in medium heat until the liquid reduces. Stir occasionally so the whole thing doesn’t burn.
YUM YUM YUM. Just continue to steam with the cover on.
The liquid will start to reduce/bubble/caramelize/thicken.
Add the onions, stir gently to incorporate into the mix. Cook for another minute or two just to soften the onions.