For the perinaise, mix everything listed together, then season to taste.
Season the chicken with salt and pepper according to preference, then mix in half of the marinade. Leave in the fridge overnight.
Preheat the oven to 220C or 200C Fan 0r 425F or Gas 7
Remove the chicken from the fridge half an hour before cooking and place it into a roasting tray. Add 100ml of water to the base of the dish.
Roast the chicken for an hour or until the juice runs clear or the internal temperature reads 75 degrees centigrade on a temperature probe. Baste the chicken regularly while cooking.
When the chicken is cooked through, remove from the oven and allow to rest for 10 minutes. Serve with the Perinaise.