Mix the dry ingredients: In a large bowl, combine the flours, tapioca starch, ground almonds, salt, linseed, and psyllium.
Add the butter: Rub the butter into the dry ingredients using your fingertips until it looks like rough breadcrumbs (but not sand).
Stir in the egg: Add the beaten egg and mix with a fork.
Add water: Sprinkle in small amounts of water and toss the mixture with your fingers. Continue adding water until the crumbs start to form clumps.
Don’t overwork the dough: Gently turn the crumbs with your fingers, not kneading too much. The dough should be soft, almost sticky.
Knead gently: Briefly knead the dough into a ball.
Flatten and chill: Flatten the dough between two sheets of baking parchment to about 5cm thick. Chill for at least an hour (overnight is best).
Fix crumbly dough: If the dough is crumbly after chilling, crumble it, add 2–3 tsp of water, and gently knead again.
Freeze and store: The pastry freezes well for up to 2 months. Defrost overnight in the fridge and use chilled.
Alternative – for sweet shortcrust pastry add 50g light muscovado sugar with the flours.
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