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PrintThis oven-roasted corned beef brisket is tender, juicy, and packed with bold spice flavor. Finished with a tangy-sweet mustard glaze, it’s perfect for holidays or hearty dinners.
3–4 lb corned beef brisket (with spice packet)
2 tbsp Dijon mustard
2 tbsp brown sugar
1 cup low-sodium beef broth or water
Optional: 4 garlic cloves, 1 sliced onion
Preheat oven to 300°F (150°C).
Rinse brisket and pat dry. Place in a roasting pan, fat-side up.
Mix mustard and brown sugar into a paste. Rub over brisket.
Sprinkle spice packet over the top.
Pour broth into the pan. Add garlic and onion if using.
Cover tightly with foil or a lid. Roast for 3½ to 4 hours.
Uncover and roast 30 minutes more to brown the top.
Rest 10–15 minutes. Slice against the grain and serve.
For a sweeter crust, increase brown sugar to 3 tbsp.
Store leftovers refrigerated up to 4 days.
Serve with cabbage, carrots, or roasted potatoes.