Place the pork rind skin-side down and, using a sharp knife, make lots of light scores in the fat, or ask your butcher to do this for you.
Grind the fennel seeds with 1 tablespoon of sea salt in a pestle and mortar and sprinkle onto the pork, rubbing into the slashes with your fingers.
Leave for 20 minutes to allow the salt to remove excess moisture.
Using scissors, cut the pork rind into chunks and place on a roasting tray, and place in the oven. As the pork scratchings roast, they’ll release lots of fat – spoon this out every so often and set aside for roasting potatoes.
After 20 minutes, turn down the oven to 160ºC/Fan 140°C/Gas 3 and bake for 35 to 40 minutes until the scratchings become hard and crispy.
Line a plate with a double layer of kitchen paper, and spoon the scratchings out to drain.
Notes
You can't beat a bowl of pork scratchings with a nice pint of beer.