Remove the pork from the fridge. Cut it into 4-6 equal parts. Optional: If prefered, you can trim off excess fat. I suggest keeping it on, however, since fat = flavor. It will melt off of the meat throughout the cooking process and will be easy to remove when shredding.
Season the pork with a generous amount of sea salt and cracked pepper. Set it aside to come to room temp (this results in a more even cook) and prep your vegetables.
Activate Sauté mode (Normal) on the Instant Pot and add a TBSP of oil. When hot, place 2 or 3 chunks of pork into the Instant Pot. Do it in batches so you don’t crowd them in the pot.
Sear each side for about 2-3 minutes or until the exterior of the pork is nicely browned, then transfer the pieces to a plate. Repeat with the rest of the chunks of pork.
Add more oil to the pot if needed, then add the onions, carrots, and celery. Season with a pinch of salt, and sauté until the veggies are tender and the onions are translucent. Stir in garlic and let it simmer for about 30 seconds.
Stir in the tomato paste, then add the wine. As it simmers, use a mixing spoon or spatula to scrape up the browned bits on the bottom of the pot. Let it all simmer for about 3-4 minutes or until the liquid has reduced.
Toss in the dried porcini mushrooms, bay leaves, herbs, crushed tomatoes, broth, and a pinch of salt and pepper. Add in the chunks of pork, followed by the hunk of parmesan rind.
Secure the lid onto the IP and set the valve to SEAL. Cook on manual high pressure for 40 minutes; let it naturally release naturally for 15 minutes afterward, then hit the valve to manually release.Carefully remove the pork and transfer it to a cutting board to shred; discard any fat.
In the meantime, activate Sauté mode (Normal) and let the sauce simmer for 5 minutes, or until the sauce has reduced a bit to thicken it up.Remove the herbs and the parmesan rind from the sauce.Stir in the tempered cream (*See recipe notes).
Transfer the shredded pork back to the pot and stir it into the sauce; this will thicken it up even more giving you the optimal cozy ragu!Serve over pasta with shredded parmesan and freshly chopped parsley.