Cut 12-15 slits in the pork shoulder or pork butt and shove a garlic clove down in each slit.
Place pork shoulder/butt in a 6QT instant pot and pour 2 cups of vegetable broth or water over it.
Slice one white onion and spread over the top and around the pork shoulder/butt sides.
Place the lid on the instant pot and set it to sealing. Pressure cook for 90 minutes (for 4lbs bone out or less) and allow the pressure to release naturally.*
Once the pressure releases (valve has dropped), remove the lid and place pork on a large cutting board to shred with two forks. The outsides of the pork should shred easily and fall away easily. The inside may be a little more challenging to shred but shouldn't require a knife.**
Optional: Preheat the oven to broil. Spread the shredded pork over a foil-lined baking sheet and broil for 3-5 minutes until slightly crispy.
To Freeze:
Freeze pork (do not broil) and broth separately.
Leave 50% volume empty since the broth will expand when frozen.
Defrost under refrigeration, then broil (if desired), and combine with broth.
Video
Notes
*Add 30 minutes for every pound over 4lbs. So if you have anywhere between 4.01lbs and 5 lbs, you'll need to add 30 minutes. **If it does, you may want to return it to the instant pot and pressure cook an additional 30 minutes with a quick release.