Dry the skin of the pork, making sure the skin has thin deep scores right through. Drizzle the oil over and rub into skin. Sprinkle salt over the skin and rub in. Refrigerate for at least 1 hour.
Preheat oven to 210°C. Place the pork on a rack over a roasting dish and put in oven. Roast for 15 minutes. Reduce temperature to 150°C and continue cooking for 45 minutes per 500g. To check whether the pork is cooked, pierce the thickest part with a knife: if the juices run clear, the pork is cooked. Alternatively, pork is cooked when the thermometer shows 71°C.
Remove pork from the oven and set aside to rest. Tip pan juices into bowl. For super-crispy crackling, remove the crackling from pork and place back on the rack. Increase the oven temperature to 190°C for 10 minutes.
To make gravy: Measure 3 tablespoons of the pan juices into a small saucepan. Add flour and cook, stirring, until the flour turns a nut brown. Slowly add stock or water and stir continuously, until the gravy thickens and boils. Reduce heat and simmer for 2 minutes. Season to taste.
Slice pork. Serve with Wattie’s Rosemary & Garlic Potato Roasters, seasonal vegetables, gravy and apple sauce.