Generously season all sides of roast with salt and pepper.
Set pressure cooker to “saute.” When hot, add oil. Place the roast in the oil and sear each side of the roast for 3 minutes.
Pour water into an Instant pot and scrape the bottom with a wooden spoon to remove the stuck-on pieces.
Place all other ingredients in an electric pressure cooker around the roast.
Cover with the lid and set the valve to sealing. Cook on “pressure cook” or “manual” for 50 to 75 minutes (using the maximum time for a larger roast if you want it to fall apart and less time if you want it to remain intact when cut.) Allow the pressure to release naturally for 10 minutes before a quick release.
Remove roast and vegetables. If gravy is desired, you can add a slurry (¼ cup water mixed with 2 tablespoons of cornstarch) to the au jus, cooking on saute and stirring occasionally until thickened.
Notes
If gravy is desired, add ¼ cup water and 2 tablespoons cornstarch to the ingredients list.