In your Instant pot or slow cooker. Add the chopped onion, Worcestershire sauce, garlic powder, ground mustard, lime juice, ginger beer and pork loin roast.
once all the ingredients are placed in the instant pot. Place the lid on and cook on high pressure for 90 minutes. The Pork should Instantly fall apart once it is done cooking.
Place all of the ingredients in the slow cooker and cook on low for 6-8 hours. shred pork when it is done cooking.