Preheat the oven to 220C/427F/Gas7.
Line a roasting tin with sheets of foil big enough to fold over the top of the pork. Pat the meat dry with a paper towel and place it in the tin. Mix together the salt, sugar and paprika and rub about half into the meat.
Put the pork into the hot oven for about 40 minutes until well browned, then take it out and turn down the heat to 125C/245F/Gas2. Fold the foil over the top to make a sealed parcel. Put back in the oven and cook for about 6–7 hours, until the internal temperature measures 89C. Pour off the juices and reserve.
Turn the heat back up to 220C/427F/Gas7 and cook the pork, uncovered, for 10 minutes to crisp up. Remove the pork from the oven, cover with a tent of foil, and leave to rest for 30 minutes.
Use two forks, or your fingers to pull into shreds, cutting up the crackling too, and then add the rest of the seasoning, and any meat juices from the tin, and stir in. If possible, leave to soak for 24 hours before reheating in a warm oven to serve.
Make you coleslaw In a large bowl, combine the miso, lemon juice, vinegar, olive and sesame oils, and pepper to make a thick dressing. Toss in the kale, apple, and carrots, and mix continuously for a couple of minutes to coat the kale very well. Make it at least an hour or two before serving. Store in the refrigerator.
To assemble sandwiches, cut the rolls in half and place a heap of shredded pork on the bottom half of each bun. Top with a generous mound of the kale slaw. Place the other roll half on top and serve.