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To make the pastry, place the flour, xanthan gum, sugar and salt in a bowl and gently mix.
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Break in the butter then rub it in with your finger tips until you get a breadcrumb consistency.
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Add in the egg yolk and a tbsp of the water and mix with a round ended knife to bring together, slowly add more water until it comes together into clumps, you should get a dough that you can handle easily, isn't to sticky and doesn't crumble apart.
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Grease a flan dish, I used a 26cm one, roll out the pastry on a well floured surface or between two pieces of greaseproof paper, then lay over the flan dish, push into the corners and trim any excess. Use a fork of create a few pin prick holes in the base.
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Cut a piece of greaseproof paper to bigger than the size of the dish and place inside, the pastry case, add baking beans or rice to the middle to weigh down.
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Place the case in an oven preheated to gas mark 5/190c and blind bake for 15 mins until it starts to brown.
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While that is in the oven, in a jug or bowl place all the custard ingredients except the nutmeg, use a bell whisk to mix together thoroughly, let sit while the pastry finishes blind baking.
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Remove the pastry from the oven, remove the beans/rice and the greaseproof paper, press down any bits that may have bubbled up.
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Pour the custard mix into the case then sprinkle the nutmeg over the top.
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Place back in the oven for another 40-45 mins until the custard in cooked and the pastry edges are well browned.
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Remove from the oven and allow to cool fully, it is best served chilled to let it cool then refrigerate for a few hours before serving.





