For the baking dish: – 4 onions quartered – 4 heads of garlic cut in half to expose the clove – 1 whole celery large chop – 1 pound carrots large chop – 4 fresh or dried bay leave For the turkey: – 15 - 20 pound thawed whole turkey innards removed and discarded – 1 ½ cups unsalted butter very soft – 6 garlic cloves minced – 3 tablespoons chopped fresh Italian parsley – 2 tablespoons lemon juice fresh squeezed – 1 tablespoon chopped fresh rosemary – 1 tablespoon chopped fresh thyme – 1 tablespoon chopped fresh sage – 1 tablespoon kosher salt – 2 teaspoons poultry seasoning – 1 ½ teaspoons black pepper For the cavity: – 1 small lemon thinly sliced – ½ navel orange thinly sliced – 1 head garlic cut in half to expose the clove – 1 cup fresh Italian parsley leaves – 5 fresh thyme sprig – 4 fresh or dried bay leave – 2 sprigs rosemary – 1 sprig sage For the gravy: – 4 cups dripping – ½ cup unsalted butter – ½ cup all-purpose flour – ¾ teaspoon black pepper – Salt to taste