Roast chicken with tarragon, garlic and lemon

1.Preheat oven to 175°C. Combine butter, oil, tarragon, garlic and lemon rind in a bowl. Carefully separate skin from breast of chicken by running your fingers under skin, keeping skin intact. Evenly distribute most of the herb butter under skin with your hands, rubbing remaining over the chicken. Season chicken with salt, then truss legs with kitchen string and fold wings under. Transfer to a roasting pan and roast, basting every 20 minutes, until the juices run clear when a thigh is pierced with a skewer (45 minutes for a 1.4kg chicken and up to 1 hour 15 minutes for a 1.8kg chicken). Set aside loosely covered with foil to rest (15-20 minutes), then serve with pan juices mixed with a squeeze of lemon to spoon over.