Step 4. Set your oven to 350 degrees Fahrenheit, preheat and then set the roasting pan in your oven. Because this is a dry-heat method of cooking, do not cover the pork shoulder or add any liquid to the roasting pan.tep 2. Set the pork shoulder on a rack in a shallow roasting pan to allow fat to drip off the meat during roasting. Insert an oven-proof meat thermometer into a meaty section the shoulder roast; avoid placing it near a bone.