01 - Preheat the oven to 400°F.
02 - In a small bowl, combine lemon juice, olive oil, garlic, thyme, rosemary, salt, and pepper to make a marinade.
03 - Pat the chicken dry with paper towels. Rub the marinade all over the chicken, including under the skin and inside the cavity.
04 - Stuff the chicken cavity with lemon slices and a few sprigs of fresh herbs if desired.
05 - Arrange the potatoes, carrots, and onion in a large roasting pan. Drizzle with a little olive oil and season with salt and pepper.
06 - Place the chicken on top of the vegetables.
07 - Roast for 1 hour and 15 minutes, or until the juices run clear and a thermometer inserted into the thickest part of the thigh reads 165°F. Baste the chicken once or twice while roasting.
08 - Let the chicken rest for 10 minutes before carving. Serve with the roasted vegetables and pan juices.