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Exchanging the specified butter for rendered lard alters the melting point significantly, yielding a flakier matrix due to larger solid fat pockets during rolling. Maintaining a strict temperature below 4 degrees Celsius for all liquid additions prevents premature gluten hydration while incorporating the required moisture. Pastry success relies heavily on this thermal control.
Acidity from the lemon juice interferes with protein cross-linking, physically shortening gluten strands to ensure a tender crumb rather than a tough, elastic bread-like texture. Butter introduces water that vaporizes in the oven, creating distinct steam pockets between coated flour particles. Thoroughly rubbing the cold fat into the dry flour creates a waterproof barrier around the starch granules.
Determining structural readiness happens entirely through visual assessment without thermal tools. Chilled dough requires resting in plastic wrap for at least 30 minutes to relax internal tension before rolling out to a consistent 3-millimeter thickness. Bake the pastry until the edges turn a pale golden amber and the surface loses all damp sheen.