01 - Preheat the oven to 300°F.
02 - Pat the chicken dry with paper towels. Rub the skin thoroughly with olive oil, kosher salt, pepper, and paprika if desired.
03 - Insert lemon halves, halved garlic head, and half of the thyme and rosemary sprigs into the chicken cavity.
04 - Place carrots, celery, onion, and remaining herbs in the bottom of a large roasting pan.
05 - Set the chicken breast-side up atop the vegetables. Pour the chicken broth into the pan.
06 - Roast uncovered for 2 hours, basting the chicken with pan juices every 45 minutes.
07 - Increase oven temperature to 425°F and continue roasting for an additional 15 to 20 minutes to achieve a crispy skin.
08 - Remove from oven and let rest for 10 minutes. Carve the chicken and serve alongside the roasted vegetables.