Rub each slice with kosher salt and black pepper to taste.
Pour some olive oil into your Instant Pot and press “Sauté” button.
Add your meat and cook for about 3 minutes per side, until it browns.
Take out the meat and place the trivet inside your Instant Pot.
Place 1 slice of meat onto the trivet, top it with half of your chopped vegetables, add the other slice and top it with the rest of the vegetables.
In a small bowl, mix vinegar, sugar and ketchup
Pour the prepared sauce over your meat.
Lock your Instant Pot and cook on high pressure for about 60-80 minutes (the more you cook it, the more your meat will be tender, so you can really do as you prefer).
When cooking time ends, wait for a natural pressure release.
Open the lid, let your dish cool for about 20 minutes and serve.