In the bowl of a stand mixer, combine flour, salt, and malt powder.
Add butter.
Mix with the paddle attachment until butter is combined with flour mixture but small chunks of butter remain.
Stir in lemon juice and water just until flour mixture is moistened.
Turn out onto a floured surface.
Form into a rectangle.
Wrap in plastic wrap.
Refrigerate for 20 minutes.
On a lightly floured surface, roll dough out into an 8 inch x 12 inch rectangle.
With one of the short sides toward you, fold bottom third of dough up.
Fold top third of dough down. It will cover the piece you just folded up.
Turn dough 90°.
Repeat rolling and folding.
Rewrap in plastic wrap.
Refrigerate for 20 minutes.
Remove from refrigerator.
Repeat the rolling and folding steps exactly as before.
Rewrap in plastic wrap.
Return to refrigerator for 20 minutes.
Repeat rolling, turning, and refrigeration one more time.