01 -
Add quartered onion, smashed garlic, and all spices into the Instant Pot.
02 -
Place corned beef brisket fat side up on top of the aromatics, then pour in beef broth.
03 -
Close the Instant Pot lid and lock it securely; set the valve to sealing position.
04 -
Select 'Stew/Meat' setting and cook under high pressure for 75 minutes. Allow natural pressure release for 20 minutes, then quick release any remaining pressure.
05 -
Transfer brisket to a foil-lined baking sheet, fat side up. Spread spicy mustard over the top. Broil on low setting about 8-10 inches from heat source until well caramelized, approximately 2-3 minutes. Monitor closely to prevent burning.
06 -
Slice the brisket thinly against the grain for optimal tenderness and serve with preferred side dishes.