Turn the instant pot onto Sauté mode. Add 1 tablespoon oil followed by the meat. Sear the roast on all sides (4-5 minutes each side) until nicely browned.
Add the pepperoncini peppers, ranch mix, au jus mix, butter and ¾ cup of water. Cover with the lid and close the steam valve.
Turn off Sauté mode and set to “Manual” mode for “High” Pressure Cook for 80 minutes.
After the cooking cycle finishes, allow for a natural pressure release (about 15 minutes).
After that, use the quick pressure lever to manually release any remaining pressure and turn off the pot.
Carefully remove the lid and transfer the roast to a plate and serve.
Oven:
Preheat oven to 350°F (175°C).
Place an oven-proof pot on medium heat and add 1 tablespoon oil. When hot, sear the roast on all sides (4-5 minutes each side) until brown.
Add the pepperoncini peppers, ranch mix, au jus mix, butter and ¾ cup of water. Bring to a simmer and cover.
Transfer to the oven and roast for 3-4 hours until the meat is fork-tender.
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