Use a sharp metal skewer, a wooden skewer, or a fork to make many holes in the pork skin but don’t make it too deep. Slice the skin of the pork into small pieces. Cut only the skin
Place a pork belly into a bowl and you have to turn the skin of the pork side down. And then pour the vinegar just over the skin and leave it for 20 minutes.
To make a pork belly dry out and create more crispy skin, place the pork belly into an Air fryer. Let the meat side down and set up the heat for 80º C for 60 minutes.