Wash the brisket well and pat it dry. Press the brown sugar firmly on to the brisket on all sides. Place it in a casserole and cover it. Refrigerate for 2 days.
Crush the juniper, allspice, peppercorns and salt together. On the third day, press ⅕ of the mixture into the meat. Repeat on each of the ensuing 4 days, covering it and returning it each time to the re