Cut the pork into large chunks.
Combine the spices and adobe chili.
Rub each piece of meat with the spice rub.
Add the orange juice and beer to the instant Pot.
Add the wire rack to the base of your Instant Pot and set the chunks of meat on top.
Sprinkle the garlic powder over the meat.
Place the lid on top and seal.
Set to high pressure and cook for 60 minutes followed by 15 minutes natural steam release.
The meat should be easily shredded with two forks, if it isn't place the lid back on and cook for another 20 minutes.
Once the meat is done take the chunks out of the pot and shred on a cutting board.
Transfer the shredded meat to a baking sheet pan lined with foil.
Place the shredded carnitas under the broiler for about 3-4 minutes and the ends of teh meat begin to crispen.
Serve on mini corn tortillas with cilantro and red onion.