/ 2oz cup caster sugar

Caster sugar, also known as superfine sugar or castor sugar, is a refined granulated sugar with exceptionally fine crystals, finer than standard granulated sugar but coarser than powdered sugar. Produced from sugarcane or sugar beets through a crystallization process that yields uniform, small grains typically measuring 0.5 to 1 millimeter in diameter, caster sugar dissolves rapidly in liquids and incorporates smoothly into batters and doughs. The sugar is white and free-flowing, with a neutral, sweet flavor profile identical to other white sugars of comparable purity. Named after the caster or sifter traditionally used to distribute it, this ingredient is a staple in both professional and home baking, particularly in British and Commonwealth cuisines.

Caster sugar is essential in baking and confectionery applications where rapid dissolution and smooth incorporation are required. It is the preferred sugar for whipped creams, meringues, mousses, and sponge cakes where its fine crystals incorporate air efficiently and dissolve completely without grittiness. The ingredient is commonly used to sweeten beverages, to dust over baked goods, and in the preparation of frostings and glazes. Beyond baking, caster sugar is employed in jam-making, cocktail preparation, and homemade cordials. Its fine texture makes it ideal for recipes where texture and smooth mouthfeel are important.