Preheat oven to 400 degrees. Remove roast from refrigerator, and remove plastic wrap. Place in a roasting pan, and brown evenly on all sides, rotating the roast when browned. When browned, add 1 can beer to the pan. Cover with lid or foil, reduce heat to 325 degrees and cook for 1 hour. Remove lid, and apply mop sauce every 15 to 20 minutes until internal temperature reaches 155 degrees. Remove from oven, and set on a large sheet or two of foil. Baste once more, and wrap with the foil. Place the foil-wrapped roast back in the pan (on its own, not sitting in the liquid) and return to the oven. Cook for 2 hours more. Serve with roasted veggies & potatoes, if desired.