caster sugar

Caster sugar, also known as superfine sugar or baker's sugar, is a refined sucrose product produced by crystallizing and grinding white sugar into very fine granules. The crystals are smaller and more uniform than standard granulated sugar, typically measuring 0.35 millimeters or less in diameter. Derived from sugarcane or sugar beets, caster sugar undergoes multiple stages of purification, crystallization, and mechanical processing to achieve its fine, sand-like texture. The smaller crystal size provides increased surface area and rapid dissolution properties, distinguishing it from coarser granulated varieties.

Caster sugar is the preferred sweetener in British and Commonwealth baking due to its superior dissolving properties and fine texture, which produces smoother batters and more uniform crumb structures in cakes, pastries, and cookies. It is particularly valued in the preparation of meringues, whipped creams, and custards, where rapid dissolution and smooth incorporation are essential. The ingredient is also commonly used in beverage preparation, including cocktails and beverages requiring swift sweetening, and in fine patisserie work where texture refinement is paramount. Its fine crystal structure makes it ideal for dusting desserts and creating smooth sugar syrups.