Preheat your Instant Pot using the sauté function.
In a large bowl mix ground beef, ground pork, rolled oats or pork rinds, quartered red onion, egg, fresh mint, and 2 tablespoons olive oil. Stir it all up until it’s well combined but don’t overwork the meat.
Form the mixture into 1 inch meatballs — not too big, not too small, perfect bite size.
Add the last tablespoon of olive oil to the hot Instant Pot, then carefully brown the meatballs on all sides for about 5 to 7 minutes.
Pour in distilled white vinegar to deglaze the pot.
Close the Instant Pot lid, set valve to sealing, and cook on manual high pressure for 10 minutes.
When done, let the pressure naturally release for 10 minutes. Do a quick release for remaining pressure.
Open the lid slowly and serve the meatballs with creamy tzatziki.
Notes
Serve with tzatziki sauce for dipping. Store leftovers in airtight containers.