Instructions:
- Remove the corned beef from its packaging. Rinse the brisket thoroughly under cold water. Discard the provided spice packet.
- Pour the water/broth and cider vinegar into the bottom of the Instant Pot liner. Add the peppercorns and bay leaves.
- Place the trivet inside the pot. Place the rinsed corned beef (fat-side up) onto the trivet. Seal the lid and set the vent to 'Sealing'.
- Pressure cook on High Pressure for 80 minutes (for a 3–4 lb roast).
- Once the cooking cycle finishes, allow a Natural Pressure Release (NPR) for 15 minutes. After 15 minutes, carefully quick-release any remaining pressure.
- Carefully remove the corned beef and place it on a cutting board. Tent loosely with foil to rest. Skim any excess fat from the cooking liquid remaining in the pot.
- Remove the trivet. Add the potatoes, carrots, and onions to the cooking liquid. Seal the pot again and cook on High Pressure for 5 minutes, followed by a Quick Release (QR).
- Stir the cabbage wedges and smashed garlic into the liquid. Cook on High Pressure for 2 minutes, followed by a Quick Release (QR).
- Slice the corned beef against the grain and serve immediately alongside the fork-tender vegetables.