Preheat the oven to 325°F. Place all but last ingredient in a real, non-disposable, roasting pan. Throw in the onion skins and combine. Place the turkey in the pan, breast side down. Cover the pan loosely with foil, and bake for about 2 1/2 hours. Turn the turkey over, discard the foil, and bake uncovered about 1 hour more, until the breast gets a deep amber color and the juices run clear when you pierce the breast with a knife. Transfer the turkey onto a slicing board.