This is the cheapest cut of pork you can buy.
Rub the pork with the oil and salt then leave, uncovered, in the fridge for at least 2 hrs, but preferably overnight. When ready to cook, heat oven to its maximum setting. Lay the pork on a rack over a roasting tin, making sure the skin is exposed. Roast for 10 mins before turning down the heat to 180C/fan 160C/gas 4, then leave to cook for a further 1½ hrs. Have a look at the pork – if the skin isn’t crisp, turn up the heat to 220C/fan 200C/gas 7, then cook for another 30 mins until crisp. Leave to rest on a board for at least 10 mins.