Using fingers to slide under the chicken skin and gently loosen over the breasts and legs
Mix together the butter with the garlic, salt, pepper, herbs and mustard
Spread the butter evenly under the skin
Place the chicken on the rack and put in the oven
In another bowl, combine the lemon juice with the mustard, brown sugar and melted butter
Set aside
Roast the chicken for 50-60 minutes then brush with the lemon butter mix and continue roasting for at least 10 minutes longer, brushing a few more times with the butter mix
Check that the chicken is cooked through and let rest for 10 minutes before serving
Serve the chicken with your favourite roast vegetables and pour over the butter and cooking juices from the baking tray