Mix together oil, salt, cumin, chile powder and pepper.
Coat pork pieces in mixture.
Brown in pressure cooker on saute setting or in a pan on the stove.
Place meat into Instant Pot or slow cooker.
Add in onion, garlic, oregano, cinnamon stick and juices.
In a pressure cooker, cover and lock on lid. Use Meat setting allow to come to pressure, auto setting will cook for 35 minutes. Do a 10 minute natural release.
In the slow cooker, cover and put on low for 6-8 hours.
Shred meat and place on a baking sheet under broiler for 5 minutes to crisp up edges.
Reserve juices to pour over meat before serving if desired.
