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Sift together the flour, xantham gum sugar and salt
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Cut the butter into chunks and rub into the flour to make a breadcrumb consistency.
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Mix in the egg yolk using a round ended knife or your hands.
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With a round ended knife, gradually mix in the water until you reach a nice doughy consistency. You might need more or less than the 2 tbsp specified.
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Wrap in cling film and chill in the fridge for 15 mins at least before use.

