Using the
Instant Pot: With just the metal bowl inserted (no extra pieces), turn the Instant Pot onto "Saute." Add the butter and wait until melted. Once melted, add the seasoned pork tenderloin. Brown for 3 to 4 minutes on 3 to 4 sides, or until each side is browned. Press "cancel," cover with 4 to 6 cups of water, and lock the lid into place. Set to cook for 35 minutes. Once the timer goes off, let the pressure release naturally before removing the lid.