Function of magarine in shortcrust pastry?

Margarine in shortcrust pastry serves as a fat that contributes to the pastry's tenderness and flakiness. It inhibits gluten formation by coating flour particles, resulting in a softer texture. Additionally, margarine adds moisture and richness, enhancing the overall flavor of the pastry. The proper incorporation of margarine also helps create a desirable crumb structure, making the pastry easier to work with.