Sift flour & salt. Divide in halves. Place each portion in separate basins. With a knife cut butter onto one portion, just cut it with a knife. Beat the egg. Add water & lemon juice. Mix. Add this liquid to other portion of the flour to make a soft dough.
Add first mixture (flour & butter) to soft dough. Mix together lightly until the crumbs of the first mixture combined with the dough.
Turn onto floured surface. Toss lightly. Roll out one way into oblong sheet. Pull corners to keep oblong shape. Fold in three like an envelope then in two the opposite way. Wrap up in floured greaseproof paper & place on a plate in the fridge. Leave ½ to 1 hour.
Roll out and fold again.
This pastry is now ready to be used.