thanksgiving turkey recipe

1 whole turkey (12-14 pounds), thawed if frozen 1/2 cup unsalted butter, softened 3 cloves garlic, minced 1 tablespoon chopped fresh rosemary 1 tablespoon chopped fresh thyme 1 tablespoon chopped fresh sage Salt and pepper to taste 1 lemon, quartered 1 onion, quartered 4 cups chicken broth or turkey broth