The fine crystal of Chelsea Caster Sugar dissolves easily and is ideal for meringues, puddings, beverages, jellies and light cake mixes such as sponge cake and cupcakes; Chelsea Caster Sugar is a must for recipes where it is beneficial for the sugar to melt and caramelise quickly and also recipes which call for short cooking times; Because of this you can substitute Chelsea Caster Sugar for Chelsea White Sugar but be careful substituting the other way round as your sugar may not dissolve properly and your baking will then have a gritty texture.