Instant Pot:
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.
Notes
Don’t add liquid to the crockpot: There’s no need to add any liquid to the slow cooker, unlike with the Instant Pot or oven methods. The slow cooker traps steam generated from cooking, keeping the roast moist. In addition, it also draws the juices from the meat. So you will get more flavorful meat and gravy if you don’t add any liquid.
To add potatoes and carrots: You can add vegetables such as carrots and potatoes (small yukon gold or quartered russet) in the last 2 hours of cooking, making it a complete meal.
To reheat: Leftover Mississippi roast keeps well in the fridge for up to 4 days when wrapped properly. It’s best to reheat in a skillet for about 10 minutes or until cooked through.
To freeze: You can also store it in a freezer-friendly container for up to 2 months.
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