Place pork shoulder in the bottom of the liner pot. In a medium bowl, whisk together the sauce: water through chili paste. Pour mixture over the pork.
Close the lid, make sure the vent is closed then press "MEAT/STEW". Once the timer goes off, release the pressure naturally using NPR. This may take up to 30 minutes.
Remove pork from pot and shred with two forks. Serve with warm corn tortillas, shredded cabbage, minced onion and cilantro.
Notes
Nutrition facts do not include tortillas or garnish as those will vary by brand and type.