Preheat the oven to 200 C / 400F.
Place the chicken, onions and carrots in a deep-sided roasting pan.
Mix all the liquid, mustard, honey, garlic and herbs together and pour this sauce over the chickens and into the cavity.
Drizzle over the olive oil and season the chicken with salt and pepper.
Roast uncovered for 1 1/2 hours and until the chickens are cooked.
Turn the chicken over halfway through so that the underside gets golden brown and crispy too. Finish it off with the last browning on the breast side at the end
Strain the pan juices, onion and carrot and use this delicious jus as your gravy.