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Preheat the oven to 220˚C and line a baking sheet with baking parchment or a reusable silicone liner.
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Clear off a nice big space on the worktop and give it a good scrub clean - you need a clear working space and it's easier to clean up after this way!
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Weigh out the 450g plain flour, stir in the sea salt and rub in the butter. Mix in the sugar then stir in the spice and baking powder.
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Rub in the butternut (see notes for how to cook it) and make sure it is well distributed, get out those lumps!
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Beat the eggs and buttermilk together then pour in all but about 4 tbsp worth into the flour mix. Use a large spatula to fold in the buttermilk, adding a little extra until you have a soft and sticky dough - you should have a couple of tbsp or so left which you will use later.
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Tip the extra 50g of plain flour onto the worktop. Scrape the scone mix on top of this extra flour and fold it over and over on itself, scooping up the flour until the dough is smooth and no longer sticky. Normally this takes 6-8 folds.
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Pat the dough out to 1.5-2 inches thick and use your scone cutters to stamp out 12 large scones. Place on the baking sheet and brush the tops with the reserved egg/buttermilk generously but don't let it drip down the sides.
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Bake for 18-20 minutes until well risen, really brown and no longer doughy if you squeeze the sides gently.
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Cool for 10 minutes before serving. Best eaten on the same day (or toast them and serve with butter on day two).