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Sift the flour and salt together into a bowl. Make a well in the middle, add the lemon juice, and stir with a knife, adding enough cold water to make an elastic dough.
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Place on a floured board and knead for five minutes until the dough is smooth and doesn't stick to your fingers.
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Roll the dough into a rectangle large enough to cover the butter. Put the butter in the middle of the dough and fold the dough ends over the butter.
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Flatten the dough with a rolling pin, then roll out gently (so the butter does not come through the dough) into a long strip.
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Fold the ends of the dough towards the middle, forming three layers. Press down gently. Let pastry rest in a cool place for 15 minutes.
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Place the pastry on a floured surface with the unsealed edge towards you. Roll and fold as before. Turn and repeat three more times.
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Leave the pastry to rest in a cool place for 10 minutes.
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Place the pastry on a floured surface with the unsealed edge towards you as before. Roll and fold again, turning and repeating three more times, as before.
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The pastry is now ready for use. Use in your favorite recipe.