Rock sugar or rock candy is crystallized sugar. It has a transparent color and tastes milder than granular sugar. It is commonly used in Chinese cooking as a sweetener and yields better cooking results than does granular sugar.
In Chinese cooking, rock sugar can be divided into monocrystal rock sugar and multicrystal rock sugar. Usually,used as a drink sweetener or candy snack, for example, in chrysanthemum tea. The latter is used in cooking especially in soups and braised dishes. By using rock sugar, the cooked meat will have a shiny appearance and a more delicate flavour.