Heat vegetable oil; working in two batches, add pork and cook until evenly browned, about 3-4 minutes.
Stir in beer, orange juice, lime juice, garlic, oregano, chili powder, cumin, salt and pepper. Select manual setting; adjust pressure to high, and set time for 30 minutes. When finished cooking, quick-release pressure according to manufacturer’s directions.
Remove pork shoulder from the Instant Pot® and shred the meat using two forks; season with salt and pepper, to taste, if needed.
Preheat oven to broil. Place pork onto a baking sheet and broil until crisp and crusted, about 2-3 minutes.
Serve immediately.
Notes
Don't skip the beer. The beer serves as a braising liquid, helping to tenderize the meat, provide moisture and add flavor.
Add some heat. For a kick of heat, add 1 diced jalapeno or chipotle pepper in adobo sauce with a little bit of sauce for added smokiness.
Broil for a few minutes. For that favorited crispy texture and all the flavorful brown bits, pop the shredded pork carnitas on a baking sheet in a single layer with a little bit of the pan juices, broiling until crispy.
Mix it up. Swap out the pork for boneless, skinless chicken breasts or thighs.
Freeze as needed. Divide the carnitas into meal-sized portions in freezer-safe bags, thawing overnight in the fridge for a quick and easy dinner.