Set a 6-quart Instant Pot to saute; add olive oil.
Sprinkle pork loin evenly with salt and pepper.
When oil is hot, add pork to Instant Pot.
Cook until browned on both sides, about 4 minutes per side. Remove pork; set aside.
Add onion and garlic to Instant Pot; saute 3 minutes, stirring occasionally.
Add wine to Instant Pot; stir to release browned bits.
Press Cancel to reset Instant Pot. Stir in tomatoes, olives, zest, and thyme or oregano. Return pork to Instant Pot.
Place top on Instant Pot; twist to seal and lock. Turn Steam Release Valve to “sealing.”
Set Instant Pot to cook at High Pressure for 16 minutes.
After cooking is complete, let pressure release naturally (approximately 10 minutes). After
that, manually release the pressure by turning the Steam Release Valve to “venting.”
Remove pork from Instant Pot; let rest 5 minutes.
Slice pork as desired, and top with tomato-olive mixture.
Notes
Be sure to purchase pork loin for this recipe, instead of pork tenderloin, which is a much smaller cut of meat and will cook faster.
Use a dry white white wine, such as Pinot Grigio, for this recipe.
To add even more flavor, use a can of diced tomatoes with roasted garlic.
Customize this recipe to suit your tastes. You can use kalamata, Castelvetrano, or your favorite green olives. Substitute lemon zest for the orange zest, if desired.
Serve with juicy roast with orzo, steamed rice, or crispy roasted Greek-style potatoes.