You will need to buy a butternut squash that can fit in your mandolin. Choose a squash that has a top that is no more that 4" in diameter, but don't go too narrow or your bites will be very small! (The top is narrower than the bottom where the seeds are). Variation: You can also cook the butternut squash tortillas in a pan with a little clarified butter or ghee. It goes a little faster but you have to pay attention to them whereas in the oven they require little attention.
For Crock Pot: Set crock pot on low for 10 hours or high for 6 hours. I prefer low for 10, it makes the pork a bit more tender.
Press 'meat' option and set to 35 minutes. When meat is done allow to sit in Ip for 15 minutes on warm mode, carefully release valve with oven mitt or spoon to release pressure.
Remove from pot and place on cutting board. Discard liquid and onions.
Use two forks to shred pork, discarding fat along the way.