However long you plan to roast your pork shoulder for, a generous rub of sea salt into the scored skin and a blast of 30 minutes in a hot oven (220C/425F/Gas 7) should ensure a crisp crackling.
then turn the belly over and rub it on the underside of the pork. Place the pork in a flameproof baking tray and roast for 25-30 minutes, or until the skin is crisp. Reduce the oven to 180C/160C ...
Rub the dry rub all over the pork ... Taste and adjust the seasoning, if necessary. Remove the pork roast from the oven and transfer to a cutting board or large platter. Tent loosely with aluminum ...