Combine water, beer, broth, onion, and garlic in a 6QT Instant Pot.
Add the trivet and add the corned beef brisket with the *spice mixture (if yours doesn't have a spice mixture, see note).
Cook on high pressure for 90 minutes. Once done, release pressure and remove brisket, tent with foil to rest.
Leave about 1 cup liquid in the Instant Pot. Add cabbage, potatoes and carrots. Set to high pressure for 5 minutes.
Quick-release pressure. Remove vegetables to a serving plate with a slotted spoon. Top with butter or sauce from the Instant Pot.
Slice corned beef across the grain and serve with vegetables.
Source:
spendwithpennies.com