Mix together in a bowl all the ingredients for the sauce / marinade (vinegar, soy sauce, garlic, olive oil, brown sugar, peppercorns, bay leaves).
Line the Instant Pot with the sliced onion rounds.
Place the pork cubes on top of the sliced onions.
Pour all the sauce / marinade over the pork cubes.
Close the Instant Pot lid. Make sure the pointer is in the sealing position. Set Instant pot to pressure cook (high) for 10 minutes. Once done, let the pressure naturally release for at least 15 minutes. Then quick release the rest of the pressure.
Open the lid, put the Instant Pot on "saute" mode, and add the pate. Mix it with the vinegar-soy mixture.
Serve with rice and scrambled eggs.