Slice pork into large chunks and season with black pepper.
Add lard or oil to your pressure cooker and select sauté. Once the oil is hot, add pork and sear in batches, then remove from the pot.
Sauté onion for about 5 minutes, then add garlic and sauté for one more minute.
Whisk vinegar, soy sauce, brown sugar, ginger, and crushed red pepper in a measuring cup or a small bowl. Pour liquid over the onions and garlic and deglaze the bottom of the pot.
Add bay leaves and pork, then cover the pressure cooker pot with its lid. Set the vent to seal and pressure cook on high for 20 minutes.
When the time is up, allow an additional 10 minutes before releasing the remaining pressure.
Serve over white rice and garnish with chopped green onion.
Notes
If the pork chunks are too small, they'll completely fall apart in the Instant Pot, so make sure to keep them somewhere between 2" to 3".
To thicken the sauce further, choose “saute” and cook down the sauce.
I like to skim the top of the liquid to remove some of the oil prior to serving it.
Store pork adobo leftovers in an airtight container for up to a week in the fridge.
If you prefer an even thicker sauce, just whisk a tablespoon of cornstarch into ⅓ cup of cold water and stir it into the pot, and bring it to a boil.