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Leave the porchetta in the fridge uncovered for around 24 hours to dry out the skin.
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Set your oven to 220ºC.
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Season the scored porchetta generously with fine sea salt and rub it into the scored skin.
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Put the porchetta on top of a metal trivet (coarsely chopped onions and carrots will work just as well) in a deep-sided roasting tray.
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Place in the centre of the oven and cook for 20 minutes.
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Reduce the oven temperature to 150 degrees, and roast for 22 minutes per 500g.
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Check the joint when there are 20 minutes of cooking time remaining — if the crackling requires, return the heat to 220ºC. Conversely, if the crackling is scorching, loosely cover it with foil to prevent it from catching and burning.
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Rest for a minimum of 25 minutes.
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Slice into thin slices, which is our preference, or as preferred.