Once the beef is tender, turn off the heat. Either leave it sitting in the cooking liquor if you're not ready to eat (it can sit like this for up to an hour), or use two forks to lift the meat out, allow the water to drain off, then put it on a board. Keep the liquor if you plan to reheat or freeze the salt beef. Cover loosely with foil and allow to rest for 10-15 mins. To serve, slice thickly against the grain of the meat or it will crumble. Serve hot or cold.
Leftovers will keep in the fridge for three days and in the freezer for up to six weeks. Before freezing, it’s best to slice it and wrap first in baking parchment, then foil. Make sure you also freeze the pot of cooking liquor. When you want to eat it, defrost and then put it (with slices arranged back into a whole brisket shape) in an ovenproof dish with the thawed liquor. Cover with foil and reheat at 180C/160C fan/gas 4 for 20 mins.