Pour about 1/2 jar of sauce over pork then wrap in foil to look like a Christmas cracker (make a tent so foil does not touch the meat - except on the bottom).
Place in oven for about 1hr - midway through open foil and turn the meat.
After 1hour, open the foil and allow to cook for about 15mins.
When pork is cooked, remove from oven, transfer to carving plate and leave to stand before slicing thinly.
Pour sauce from foil into a serving jug. Boil kettle and use hot water to catch remaining sauce on foil and dilute to create gravy. Serve with the pork on some rice.
Recipe by tasty at http://tasty.haribotech.co.uk/?p=129