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Superfine sugar (also known as castor or ultrafine sugar) is an incredibly fine grain of sugar, finer than both extra-fine and baker's sugars. Its claim to fame is its ability to easily dissolve. Consequently, superfine sugar is often used when making meringue or to sweeten cold liquids-hence its nickname "bar sugar".

Superfine sugar can be substituted teaspoon for teaspoon with granulated sugar. But there's no need to run to the store-it's easy to make your own. Just grind granulated sugar in a coffee grinder, food processor, or blender for about one minute.

Updated: Saturday, December 29, 2007.