Sprinkle the pork skin with salt and leave for 20 minutes.

Preheat the oven to 400F (200C).

Pat dry with paper towels and use kitchen shears or a sharp knife to cut the skin into strips.

Place the strips onto a baking sheet lined with a silicone mat, and put a second silicone mat on top. Then place a second baking sheet on top to help weigh everything down. 

Roast for 25 minutes until crispy.

If you like, you can quickly shallow fry them in a little olive oil for a few minutes, turning frequently. This will make them puff up a little! 

Pat dry with paper towels, season with a little more salt and either serve warm, or leave to cool and store in an airtight container.