1. Combine the garlic powder, onion powder, marjoram, parsley and cayenne; rub over roast. Place in a large shallow glass dish. Cover and refrigerate overnight.
2. Place roast bone side down in a shallow roasting pan. Bake, uncovered, at 350° 80-90 minutes or until a thermometer reads 145°. Let stand for 10 minutes before slicing. Yield: 8 servings.