Preheat oven to 240°C/220°C fan-forced. Rub the pork rind with oil then salt. Place pork into a shallow baking pan lined with baking paper. Roast for 40 minutes or until golden and a crackling forms.
Preheat the oven to 300°F (150°C). Cut the pork into large chunks and place in a dutch oven. Add the onion, garlic, water, apple cider vinegar, and salt to the dutch oven. Stir to combine.