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Make the stuffing first. Melt the butter and oil and add the onions and sage - cook stirring regularly over a medium heat until softened and starting to colour around the edges. This may take 10-15 minutes (don't turn the heat up and burn them!).
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Take off the heat to cool to room temp.
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In a food processor, put the remaining stuffing ingredients plus the cooled onions and pulse until well combined. (Reserve a quarter of the stuffing and either freeze for another day or cook in a small baking for the last 30-40 minutes of the turkey cooking time.)
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Preheat oven to 220˚C using an internal oven thermometer
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Take the turkey breast and place it skin side down on a chopping board (if it's already tied, just cut it off).
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Open up the breast as flat as it will go then slice down the central sinew which runs down the middle in the long axis of the breast, to open up the smaller fillet like a book. Try not to cut all the way through and aim to even up the thickness across the whole piece.
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Place the stuffing down the centre of the prepared turkey then fold up the edges and lay the streaky bacon across to help seal and hold the stuffing in.
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Using fresh string, start tying up from one end, holding everything together firmly (i.e. not as tight as you can possibly make it!).
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Zest one of the clementines and cut them all in half. Place cut side up in your roasting dish and sit the turkey bacon side down on top of the fruits (skin side up). Sprinkle with the clementine zest, sea salt, black pepper and sage.
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Pour a cup of water into the base of the roasting pan and cover with a tent of foil sealing the edges tightly to keep the steam in.
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Place in the oven and turn the heat down to 180˚C using an oven thermometer (the best £5 I ever spent!) as your guide - oven dials are very unreliable and putting such a large cold object in the oven as this foil wrapped roaster filled with cold meat, the temp will drop rapidly so do keep an eye out to keep it to temp.
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Cook for 90 minutes, taking the foil off for the last 10-15 minutes.
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Check it is done by taking the turkey out of the oven and inserting an oven thermometer into the thickest part - it should reach 70˚C for 2 minutes to be fully cooked. Return for 10 minutes if not and check again. Juices will run clear at this point too.
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Take turkey out of the oven and place on a carving plate/board with a rim to collect any resting juices and cover with foil for a minimum of 30 minutes before carving. Drain the pan juices into a jug and reserve for gravy making. Remove the string before slicing as thinly or thickly as you wish.