Add oil and butter and allow to melt. Add garlic and onion. Cook about 2 minutes, or until garlic is fragrant and onions are translucent.
Add pork and brown, but do not cook all the way through.
Add green chilies and beef broth
Add orange and lime juice.
Add cinnamon and taco seasoning.
Mix everything together.
Set Instant pot to high pressure and 35 minutes. Close lid and make sure venting is turned off. Allow to release pressure naturally for 15 minutes. Release remaining pressure by opening valve.
Spoon pork onto a baking sheet and pull apart. Place under broiler until crispy. Reserve about a cup of the broth from the Instant pot and brush over the pork.