Castor or Caster sugar, also known as superfine sugar, is a finely granulated sugar that dissolves quickly, making it ideal for baking and mixing into beverages. Its texture is somewhere between regular granulated sugar and confectioners' sugar.
Caster sugar is available in two varieties: white (regular) and golden. The golden variety is unrefined and processed in a way that maintains some of the molasses, similar to brown sugar. It has a warmer, more caramel-like flavor than white caster sugar.
Since it's finer than granulated sugar, caster sugar dissolves and incorporates more quickly — this makes it perfect for light and airy desserts like meringues and soufflés. It's also often used to sweeten beverages, such as tea, because it doesn't need heat to dissolve. Really, though, caster sugar can be used in almost any way granulated sugar is used.
Caster Sugar vs. Granulated Sugar
Granulated sugar has a larger and coarser grain than caster sugar. Though they can generally be used interchangeably, granulated sugar does not incorporate into batters as quickly. Cakes and other desserts baked with granulated sugar instead of caster sugar sometimes have a speckled appearance due to the undissolved granules.
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