Beef Brisket with Onion Gravy. A covered oven-braised brisket with softened onions and a pan gravy, sliced across the grain. The formula and timing below are working estimates for a future kitchen trial, not a claim that a batch has been made.
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A long onion-braised roast
Flat-cut brisket becomes sliceable after a covered, low-oven braise with onions and broth. The pan liquid is finished into a simple onion gravy.

The three-pound size and four-hour window are working estimates. Brisket thickness and pot seal change the actual time.
Sear and build the pot
Brown the seasoned beef on two broad sides. Soften onions in the same pot, add garlic and tomato paste, then loosen browned bits with measured broth.
Liquid does not have to submerge the brisket, but the covered pot should stay moist. Record any added liquid during testing.
Ingredients for 8 main portions
| Ingredient | Amount | Use |
|---|---|---|
| Flat-cut beef brisket | 3 pounds | Trim only excessive surface fat. |
| Fine salt | 1 1/2 teaspoons | Season beef. |
| Freshly ground black pepper | 1/2 teaspoon | Season beef. |
| Olive oil | 2 tablespoons | Sear. |
| Yellow onions, sliced | 3 large onions | Braise and gravy. |
| Garlic cloves, minced | 4 cloves | Braise. |
| Tomato paste | 2 tablespoons | Braise. |
| Low-sodium beef broth | 2 cups | Braising liquid. |
| Fresh rosemary | 1 sprig | Remove after braise. |
| All-purpose flour | 2 tablespoons | Whisk into defatted pan liquid for gravy. |
Step-by-step method
- Heat oven to 300°F. Pat dry a 3-lb flat-cut beef brisket and season with 1 1/2 tsp salt and 1/2 tsp pepper. Heat 2 tbsp olive oil in a Dutch oven and sear beef on both broad sides, about eight to ten minutes total; transfer to a plate.
- Soften three sliced large onions in the pot about eight minutes; add four minced garlic cloves and 2 tbsp tomato paste for the final minute. Pour in 2 cups broth, scrape the pot and return brisket with one rosemary sprig. Liquid need not cover the beef completely.
- Cover tightly and braise at 300°F about 3 1/2–4 hours, turning once if liquid is low, until a fork enters readily. A food thermometer confirms beef has passed the 145°F minimum for whole beef cuts, but brisket tenderness—not that minimum alone—determines this braise's endpoint.
- Transfer brisket to a clean board and rest about thirty minutes. Remove rosemary and skim excess fat from pan liquid. Whisk 2 tbsp flour into a little cooled pan liquid until smooth, return to simmering onions and whisk several minutes until gravy thickens. Slice beef across the grain and serve eight provisional portions with gravy; test actual cooked yield and sauce thickness.
Cook past the safety minimum for tenderness
FDA lists 145°F plus a minimum three-minute rest for whole beef cuts. This brisket braise continues until a fork slips into the meat readily; 145°F alone is not a tenderness target.
A sealed 300°F oven for roughly three and a half to four hours is a starting range, not a guarantee. A thin or thick cut may deviate.
Rest and thicken gravy
Rest the roast about thirty minutes on a clean board before slicing across the grain. Remove rosemary and skim excess fat from pan juices.
Whisk flour with a little cooled liquid before returning it to hot gravy to avoid lumps. If the pan contains too little liquid for eight portions, revise the broth amount after the trial.
Serving and storage
Spoon onion gravy over eight provisional main portions. Potatoes are a separate side rather than an ingredient of this roast.
No exact make-ahead, cold-storage or reheating result has been tested. Full Chefly brisket content needs overlap review before another URL.
Brisket questions
Is this smoked brisket?
No. It is a moist covered oven braise.
Can I stop at 145°F?
That is the whole-beef safety minimum after rest, not the tender endpoint for this brisket.
Which way do I slice?
Across the grain after the roast rests.
Further reading and related Chefly recipes: Just a Little Bit of Bacon's braised beef brisket with onion gravy; FDA meat cooking guidance. These are relevant references and other dishes, not evidence that this proposed formula was tested.
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Beef Brisket with Onion Gravy. Category: Main Dishes. 8 main portions. Prep approximately 25 minutes; cooking approximately 240 minutes; additional cooling/chilling approximately 30 minutes; total approximately 295 minutes excluding preheat. Not kitchen-tested; nutrition not calculated.
Ingredients: 3 pounds Flat-cut beef brisket; 1 1/2 teaspoons Fine salt; 1/2 teaspoon Freshly ground black pepper; 2 tablespoons Olive oil; 3 large onions Yellow onions, sliced; 4 cloves Garlic cloves, minced; 2 tablespoons Tomato paste; 2 cups Low-sodium beef broth; 1 sprig Fresh rosemary; 2 tablespoons All-purpose flour.
Instructions: Heat oven to 300°F. Pat dry a 3-lb flat-cut beef brisket and season with 1 1/2 tsp salt and 1/2 tsp pepper. Heat 2 tbsp olive oil in a Dutch oven and sear beef on both broad sides, about eight to ten minutes total; transfer to a plate. Soften three sliced large onions in the pot about eight minutes; add four minced garlic cloves and 2 tbsp tomato paste for the final minute. Pour in 2 cups broth, scrape the pot and return brisket with one rosemary sprig. Liquid need not cover the beef completely. Cover tightly and braise at 300°F about 3 1/2–4 hours, turning once if liquid is low, until a fork enters readily. A food thermometer confirms beef has passed the 145°F minimum for whole beef cuts, but brisket tenderness—not that minimum alone—determines this braise's endpoint. Transfer brisket to a clean board and rest about thirty minutes. Remove rosemary and skim excess fat from pan liquid. Whisk 2 tbsp flour into a little cooled pan liquid until smooth, return to simmering onions and whisk several minutes until gravy thickens. Slice beef across the grain and serve eight provisional portions with gravy; test actual cooked yield and sauce thickness.
Allergens: Wheat; Check broth and tomato paste labels for allergens. Review packaged ingredients and cross-contact before serving.
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Beef Brisket with Onion Gravy
- Total Time: 295 minutes
- Yield: 8 servings 1x
Description
A three-pound flat-cut brisket braised with onions and broth for eight provisional portions.
Ingredients
- 3 pounds Flat-cut beef brisket
- 1 1/2 teaspoons Fine salt
- 1/2 teaspoon Freshly ground black pepper
- 2 tablespoons Olive oil
- 3 large onions Yellow onions, sliced
- 4 cloves Garlic cloves, minced
- 2 tablespoons Tomato paste
- 2 cups Low-sodium beef broth
- 1 sprig Fresh rosemary
- 2 tablespoons All-purpose flour
Instructions
- Heat oven to 300°F. Pat dry a 3-lb flat-cut beef brisket and season with 1 1/2 tsp salt and 1/2 tsp pepper. Heat 2 tbsp olive oil in a Dutch oven and sear beef on both broad sides, about eight to ten minutes total; transfer to a plate.
- Soften three sliced large onions in the pot about eight minutes; add four minced garlic cloves and 2 tbsp tomato paste for the final minute. Pour in 2 cups broth, scrape the pot and return brisket with one rosemary sprig. Liquid need not cover the beef completely.
- Cover tightly and braise at 300°F about 3 1/2–4 hours, turning once if liquid is low, until a fork enters readily. A food thermometer confirms beef has passed the 145°F minimum for whole beef cuts, but brisket tenderness—not that minimum alone—determines this braise's endpoint.
- Transfer brisket to a clean board and rest about thirty minutes. Remove rosemary and skim excess fat from pan liquid. Whisk 2 tbsp flour into a little cooled pan liquid until smooth, return to simmering onions and whisk several minutes until gravy thickens. Slice beef across the grain and serve eight provisional portions with gravy; test actual cooked yield and sauce thickness.
Notes
Recipe-development draft; not kitchen-tested. Timing and yield are estimates. Nutrition has not been calculated.
Additional chilling, resting or cooling time: 30 minutes, included in the total.
Untested estimate: about fifteen-minute sear and onions, 3 1/2–4-hour covered braise with brief gravy finish, thirty-minute rest; fork tenderness governs.
- Prep Time: 25 minutes
- Chilling, resting or cooling: 30 minutes
- Cook Time: 240 minutes
- Category: Main Dishes
Nutrition
- Serving Size: Approximately one eighth of sliced roast plus gravy
