1. Preheat oven to 325˚F. Place flat roasting rack in shallow roasting pan. Spray with cooking spray. Remove the neck and giblets from the turkey cavity. Place turkey, breast side up, on prepared rack. Twist the wing tips under back.
2. Stuff onion, celery, carrot, 2 sprigs of parsley, and 2 sage sprigs inside turkey. Tie the drumsticks together with kitchen twine. Spray turkey with cooking spray. Rub poultry seasoning and black pepper over turkey. Roast, uncovered, for 3 hours.
3. For glaze, in a small bowl, combine mustard, maple syrup, and butter. Finely chop remaining sprig of parsley; add to glaze. Cut lemon in half. Squeeze 1 Tbsp. juice into glaze. Slice remaining lemon for garnish.
4. After turkey roasts for 3 hours, brush turkey with glaze. Continue roasting an additional 30 to 45 minutes or until meat thermometer inserted in thigh registers

Each serving contains: 466 calories, 18 g fat, 5 g saturated fat, 0 g trans fat, 233 mg cholesterol, 357 mg sodium, 2 g carbohydrates, 0 g fiber, 1 g sugar, 70 g protein. Daily values: 4% vitamin A, 2% vitamin C, 4% calcium, 15% iron.