Mix brown sugar, salt, pepper, garlic powder, chili powder, ground cumin, paprika, oregano, basil, and coriander in a small bowl.
Season pork pieces with seasoning mix, rubbing it into the meat.
Select “Saute” on the Instant Pot, and add oil. Once hot, add half the pork pieces and sear for 1-2 minutes per side. Remove to a plate and repeat with remaining pork pieces, adding more oil if needed.
Select “Cancel”. Pour in beer, using a wooden spoon or spatula to scrape the bottom of the pot to loosen the browned bits. Once there are not browned bits left on the bottom of the pot, pour in the sauce you whisked together earlier.
Add seared pork pieces, along with any juices that have accumulated on the plate, and give a quick toss to coat.
Secure lid and select “Pressure Cook” or “Manual” and hit the +/- buttons until you select 45 minutes.
Once pressure cooking time has elapsed, don’t do anything and let the pot naturally release the pressure for 15 minutes, then turn the knob to release any remaining pressure.