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1
8 days before serving, combine salt, saltpeter (or pink salt), and brown sugar in a small bowl and whisk until homogenous. Rub evenly over every surface of brisket. Combine peppercorns, mustard, coriander, allspice, cloves, ginger, and bay leaves and sprinkle evenly over both sides of beef, pressing spices gently into the meat until they stick. Seal the beef in a vacuum sealed bag or a zipper-lock bag with all of the air pressed out of it. Place in coldest part of refrigerator and let rest for 7 days, flipping once a day.
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2
The day before serving, remove the beef from the bag and carefully rinse off all spices under cold running water. Pat dry with paper towels. Re-seal in a vacuum bag and cook at 180u00b0 until tender, about 10 hours. Proceed to step 4.
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3
The day before serving, remove the beef from the bag and carefully rinse off all spices under cold running water. Pat dry with paper towels. Preheat oven to 200u00b0F. Place brisket in large Durch oven, cover with water by several inches, and bring to a simmer over high heat. Remove from heat, cover with lid slightly ajar, place in oven, and cook until completely tender, about 10 hours. Proceed to step 4.
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4
Once beef is cooked, transfer to an airtight container along with cooking liquid (if cooked in a water oven, just store it in its vacuum bag). Let rest at least overnight, and up to 3 days.
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5
The day of: transfer cooking liquid to a large saucepan or Dutch oven along with carrots, potatoes, and cabbage. Top up with water until vegetables are submerged. Slice beef thinly against the grain and fan slices out in large skillet. Add 1 cup of liquid from pot to skillet and place skillet on top of pot. Cover skillet. Bring the pot to a boil over high heat, then reduce to a simmer. Cook until vegetables are completely tender and beef is heated through, about 45 minutes. Serve immediately with hot mustard.
