.5 tbsp castor sugar or sugar

Castor sugar, also known as caster sugar or superfine sugar, is a finely granulated white sugar derived from sugar cane (Saccharum officinarum) or sugar beets (Beta vulgaris). It is produced by crystallizing refined sugar to a smaller grain size than standard granulated sugar, resulting in crystals approximately 0.35mm in diameter. The finer granules dissolve more rapidly in liquids and incorporate more readily into batters and doughs, making it a preferred sweetener in many culinary applications. Castor sugar is chemically identical to regular granulated sugar (sucrose) and contains no additives; the distinction lies solely in crystal size.

In regions where castor sugar is unavailable, regular granulated sugar serves as a functional equivalent, though it may require longer dissolution times or slightly altered mixing techniques in certain recipes.

Castor sugar is extensively used in baking, confectionery, and dessert preparation due to its rapid dissolution and incorporation properties. It is the preferred sweetener for meringues, mousses, and whipped preparations where fine crystal size facilitates uniform mixing and smooth texture. Castor sugar is also commonly used in beverages, custards, and fine pastry creams where immediate dissolving is advantageous. In cocktail preparation, it dissolves readily in spirits and syrups. While functionally equivalent to granulated sugar in most applications, castor sugar produces superior results in delicate preparations requiring fine texture or where crystals must dissolve quickly without the need for heating.