Preheat your oven to 325 F. Put the skin on a baking sheet. (Lining the sheet with parchment paper will make it much easier to clean afterwards). Put the skin in the oven for anywhere between 1.5 hours to 3 hours. Most recipes call for 3 hours of cooking, but my experience tells me that most of the time it’s ready after 1.5 hours. You want them to be crispy but you don’t want them to be hard as a rock. Get it out of the oven, let it cool a bit and enjoy. They are delicious when still a little hot. If there was a lot of fat attached to it and you don’t cook them for too long, there will be a crunchy and moist side and you’ll enjoy the best of both worlds.