/ 175 g caster sugar

Caster sugar, also known as superfine sugar or castor sugar, is a highly refined granulated sucrose derived from sugar cane or sugar beets. The crystals are smaller and more uniform than standard granulated sugar, typically measuring 0.5 mm or less in diameter. This fine crystalline structure dissolves more readily and disperses more evenly in batters, doughs, and liquid mixtures. Caster sugar is chemically identical to granulated sugar (sucrose, C₁₂H₂₂O₁₁) but its superior texture makes it the preferred choice for applications requiring smooth integration and rapid dissolution.

Caster sugar is the dominant sweetener in British and Commonwealth baking, particularly for cakes, cookies, meringues, and custards. Its fine crystals dissolve instantly in wet batters and whipped egg whites, ensuring smooth texture and even sweetness distribution. It is also preferred in beverages such as iced tea and cocktails, where rapid dissolution is essential. Beyond baking, caster sugar is used as a topping for desserts and fruits, and in the preparation of syrups and candies where crystalline texture and clarity are important.