Remove the turkey from the fridge and set aside. Put the herb butter ingredients in a bowl and mash together well.
Put the turkey into a well-lined roasting tin or a foil tray placed on a baking tray (to support it).
Pat the turkey dry with kitchen roll, then use a small sharp knife to gently part the skin from the breasts at the highest point. Using a clean hand, separate the skin from the meat. Repeat on the other side of the bird too.
Push about half of the herb butter under the skin of the turkey. You can use your hands on top of the skin to help push it down. Spread the rest of the butter over the top of the skin.
When you're ready to cook, preheat the oven to 170℃ fan/190℃/Gas Mark 5/375F and cook according to the timings above (or on the turkey packaging), basing the cooking time on its weight. Baste half way through the cook time.
When the turkey is cooked through, remove it from the oven but leave it in its tray (lots of juices will come out). Set aside somewhere not too chilly in the kitchen and keep it covered with foil.
Pop a couple of clean tea towels on top of the foil to keep the heat in and let it rest for about 20 - 30 minutes.
When you're ready to serve, pour the resting juices from the tray into your gravy (if you wish). Place the turkey on a platter and carve.
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