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.
Preheat the oven to 160ºC. Put the lid on the Dutch oven and roast the pork for 2½ – 3 hours, until tender. Remove the lid, brush the skin of the pork with olive oil and turn the oven up to ...