Preheat oven to 325 degrees. Place pork in a large roasting pan. Cover the entire shoulder generously with sea salt. Place one cup of water in the pan and cover. Roast for 3 hours, then uncover and lower oven temperature to 300 degrees. Roast for another 3 hours until pork is cooked to your liking. We cooked ours to 180 degrees and it was perfect. Slice or fork large pieces off the roast. Our favorite way to enjoy this simple roast is with plain white rice or in a tortilla with avocado.