In a 6-quart Instant Pot, press the sauté button set to “normal” or “medium”.
In a medium bowl, add the pork, salt, oregano, coriander, cumin, and black pepper and rub/mix around to coat, making sure no salt or spices are at the bottom of the bowl.
Optional step: add oil to the instant pot followed by the pork. Let it cook, undisturbed, for about 5 minutes or until deeply browned (this adds more flavor). Press “cancel”.
If skipping the browning, just add the pork to the instant pot along with the orange juice, onion, chili peppers and garlic. Lock the lid in place and set the vent to “sealing”. Select “manual pressure” (set to high) and set the timer for 40 minutes.
Meanwhile, in a medium bowl, add all of your slaw ingredients and toss to coat.
Once the timer goes off, let it naturally release for 15 minutes, then manually release any more pressure, then press “cancel”. Transfer the meat, onion, and peppers to your cutting board and shred the meat and slice up the veg. Press the saute button again and simmer the liquid that is in the pot for about 10 minutes or until it reduces by about half. Press cancel and add the shredded pork back to the pot to soak up all of those juices.
Add the carnitas to your tortillas (make sure you get all the juices!) along with the slaw, pickled onions, avocado, and cilantro. Squeeze lime all over.