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Glacé icing, also known as water icing or simple icing, is a smooth, glossy topping made from powdered sugar and a liquid, typically water or lemon juice. It is a classic British and American confectionery staple, most famously used to coat and sweeten the top of a Dundee cake or a classic iced bun. Its simplicity allows it to set into a hard, sweet shell, providing a delightful textural contrast to the soft cake or biscuit beneath.
This icing is extremely high in carbohydrates, almost exclusively from sugar, and is virtually devoid of protein, fat, or significant micronutrients. A typical serving, which is a thin layer on a cake or bun, contributes roughly 50-100 calories, but its primary nutritional role is as a source of quick energy and sweetness.
Glacé icing is nutritionally unique for its almost pure sugar composition, making it a concentrated source of quick energy but offering no other nutritional value. Culturally, its simple, shiny finish is a hallmark of traditional home baking and festive treats, symbolizing a touch of simple, sweet indulgence.