Caster Sugar (Best Option)
1:1 by volumeCaster sugar is essentially granulated sugar with smaller crystals, allowing it to dissolve more rapidly in the dough. This helps distribute sweetness evenly without altering the dough’s moisture balance, which is critical for a flaky pie crust.
When using caster sugar, ensure it is well incorporated into the flour and fat mixture to avoid graininess. It behaves similarly to granulated sugar in terms of browning and texture.
The final crust will have a texture and sweetness very close to the original recipe, with no noticeable difference in flakiness or color.