Dice onion, chop garlic cloves, zest and juice one orange.Set aside.
Add the chopped onion, chopped garlic, tomato paste, lime juice, and all of the spices (except for the rub) to the Deluxe Multicooker/pressure cooker.
For the Rub: Mix together the chili powder, cumin, paprika, salt, oregano and red chili flakes,set aside. Rub all over pork, cover well. Please pork over onions, lock the lid and select CUSTOM (high pressure) for 90 minutes. Press to start.
When the timer is up, press CANCEL. Press STEAM-RELEASE to manually release the pressure. Once all pressure is released, remove pork and use Quick Shred or two fork to shred meat.