Place all ingredients in slow-cooker or Instant Pot.
If using slow-cooker, defrost pork butt prior to cooking, and cook on high setting for 8 hours or until pork is fall-apart tender. If using an Instant Pot, no need to defrost. Pressure cook on high for 1 hour.
Shred pork, then cut crosswise with knife.
Mix with all remaining juices. Enjoy!