Classic British Scottish Shortbread Fingers with Sea Salt Topping

Butter: Use unsalted butter at room temperature, as it blends more easily and helps achieve the crumbly, tender texture typical of quality shortbread. Avoid using melted butter to prevent greasy dough.

Sugar: Granulated white sugar is recommended for subtle sweetness and slight crunch; superfine sugar can be used for a finer texture. Brown sugar is discouraged as it adds moisture and alters crispness.

Flour: A combination of plain (all-purpose) flour and rice flour or cornstarch creates a tender, melt-in-the-mouth crumb. Rice flour typically yields a softer texture, but cornstarch is a suitable alternative. For gluten-free baking, substitute plain flour with a gluten-free all-purpose blend that includes a binder.

Sea Salt: Fine sea salt used in dough and sprinkled on top provides a delicious, balanced salty note. Fine table salt is an acceptable substitute, but avoid coarse salt for topping as it may be too crunchy.

Substitutions: For dairy-free or vegan versions, replace butter with a firm plant-based margarine or specialized vegan baking butter. For sugar, coconut sugar can add a caramel note but may darken the dough.

General Tips: Weigh ingredients precisely—especially flours—to maintain texture. Handle dough gently to avoid toughening. Cream butter and sugar until pale and fluffy for optimal shortbread crumb.