Roughly chop your onion, carrots, and garlic.
Preheat your Instant Pot to saute high and add 1-2 tablespoons oil. Pat dry your shanks and season generously on both sides with salt and pepper.
Once your instant pot is hot enough (for me, that's about 2 mins past when it beeps) Brown your shanks 1-2 minutes per side.
Remove the shank and add your onion, carrots, and garlic. Cook until soft – 2-4 minutes.
Add the wine and deglaze, scraping the brown bits with a wooden spoon. Reduce until about half the wine is left – 2-3 minutes.
Add passata, herbs if using, and the shanks to the pot. Set pressure to high and braise for 1 hour. Quick release when done and serve, garnish with grated Grana Padano or Parmigiano Reggiano cheese, red pepper flakes, and flat leaf parsley as desired.