Add the five sifted flours and starches into a bowl and whisk together until they are completely incorporated.

Add the cubes of cold butter into the bowl and using your fingertips, rub the butter into the dry ingredients until no lumps remain and the mixture is a fine crumb texture.

In a separate bowl, add the water, egg and salt and whisk together.

Pour the liquid into the crumb mixture and mix until all the liquid is absorbed then stop mixing.

Bring the mixture together to form a dough.

Wrap the dough in plastic wrap and chill in the refrigerator for at least 1 hour before use.

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