01 - Preheat the oven to 425°F.
02 - Pat the chicken dry with paper towels. Place it breast-side up in a roasting pan or oven-proof skillet.
03 - Stuff the cavity with the lemon halves, 2 sprigs of rosemary, 3 sprigs of thyme, 2 sprigs of parsley, and the smashed garlic cloves.
04 - Tuck the wings under the chicken. Tie the legs together with kitchen twine, if desired.
05 - Rub the chicken all over with olive oil, then season generously with salt and pepper.
06 - Scatter the onion, carrots, and celery around the chicken in the pan to add flavor and create a natural rack.
07 - Place the remaining rosemary, thyme, and parsley sprigs on top of and around the chicken.
08 - Roast in the preheated oven for 1 hour 15 minutes, or until the juices run clear when a thigh is pierced and a thermometer inserted into the thickest part of the thigh registers 165°F.
09 - Transfer the chicken to a cutting board. Tent loosely with foil and let rest for 10 minutes before carving.
10 - Carve and serve with pan juices and roasted vegetables.