INGREDIENTS
1 large yellow onion
1 beef brisket, preferably flat-cut (1.3 - 1.5kg)
2 1/2 teaspoons kosher salt, divided
1/2 teaspoon freshly ground black pepper
1 tablespoon vegetable oil
1/3 cup beef broth
1/3 cup red wine vinegar
1/3 cup tomato paste
1/4 cup packed light brown sugar
1 teaspoon dried thyme
1 teaspoon dried oregano
1 teaspoon paprika
3/4 teaspoon garlic powder
Fresh parsley, for serving (optional)
Instructions
Thinly slice 1 large onion. Ensure that the surface fat on a 1.3 to 1.5-kilogram beef brisket is no more than 1/4 inch thick, trimming it as needed. If necessary, cut the brisket in half to accommodate it in a 6-liter or larger electric pressure cooker or Instant Pot. Evenly season the brisket with 2 teaspoons of kosher salt and 1/2 teaspoon black pepper.
Using the highest Sauté function on the pressure cooker, heat 1 tablespoon vegetable oil until shimmering. Sear the brisket, undisturbed, until browned on the bottom, which takes about 5 to 6 minutes. Flip the brisket and brown the other side for an additional 5 to 6 minutes. Transfer the seared brisket to a large plate.
Add the sliced onion and the remaining 1/2 teaspoon of kosher salt to the pressure cooker. Sauté the onions until tender, ensuring to scrape brown bits from the bottom of the pot, a process that typically takes 4 to 6 minutes.
Now, incorporate 1/3 cup beef broth, 1/3 cup red wine vinegar, 1/3 cup tomato paste, 1/4 cup packed light brown sugar, 1 teaspoon dried thyme, 1 teaspoon dried oregano, 1 teaspoon paprika, and 3/4 teaspoon garlic powder. Return the seared brisket to the pot, overlapping the pieces if necessary.
Seal the lid and set the pressure cooker to cook for 70 minutes under HIGH pressure. It will require 5 to 7 minutes to come up to pressure.
After the cooking time elapses, allow the pressure to release naturally for 20 to 25 minutes. Carefully open the pressure cooker and transfer the brisket to a cutting board.
Finally, slice the brisket across the grain into 1/4-inch-thick slices. Serve the brisket with the onions and gravy. Optionally, garnish with fresh parsley.
RECIPE NOTES
Make ahead: The brisket can be prepared up to 3 days in advance. Keep the brisket covered with the gravy and reheat it along with the gravy in a baking dish covered with aluminum foil in a low oven.
Storage: Leftovers remain delicious for up to 5 days. Store the beef covered in gravy to maintain its moisture.
Sauce variation: For a velvety sauce, filter the gravy through a fine-mesh strainer into a large bowl. Return the onions and garlic to the Instant Pot. Pour the gravy into a fat separator, then transfer it back into the Instant Pot. Utilize an immersion blender to blend the sauce until it achieves a smooth consistency.