• Source: Royal icing

Royal icing is a hard white icing, made from softly beaten egg whites, icing sugar (powdered sugar), and sometimes lemon or lime juice. It is used to decorate Christmas cakes, wedding cakes, gingerbread houses, cookies, and many other cakes and biscuits. It is used either as a smooth covering or in sharp peaks. Glycerine is often added to prevent the icing from setting too hard. When placing icing on cakes, marzipan is usually used under the royal icing in order to prevent discoloration of the icing.
Usual proportions are 2 egg whites to 1 teaspoon of lemon juice, 1 teaspoon of glycerine, and around 1 pound of sugar depending on the application.
As well as coating cakes and biscuits, royal icing is used to make decorations such as flowers and figures for putting on the cake. The royal icing is piped into shapes which are allowed to harden on a non-stick surface. These can then be arranged to create edible decorative effects on a variety of sweet foods. The glycerine must be omitted for this purpose. Royal icing is often used to create snow scenes but is also used as an edible adhesive – particularly for gingerbread houses.




Health risk


Royal icing is traditionally prepared with raw egg whites, which have a very small chance of transmitting salmonella poisoning. Meringue powder or ready-to-use, pasteurized, refrigerated egg whites (wet eggs) can be used with similar results.




History


The Oxford English Dictionary gives the first mention of royal icing as Borella's Court and Country Confectioner (1770). The term was well-established by the early 19th century, although William Jarrin (1827) still felt the need to explain that the term was used by confectioners (so presumably it was not yet in common use among mere cooks or amateurs). It developed at some stage in the early 18th century, replacing earlier styles of icing which generally involved making a meringue-like concoction that was then dried out in the mouth of an oven. Elizabeth Raffald (1769) is generally credited with the addition of a layer of marzipan between it and the cake beneath. Piping with royal icing came along a little later, in the 1840s, driven by German culinary innovators. Prior to that, decoration was usually of moulded pastillage or sugarpaste.
There is a myth that it was named royal after it gained widespread publicity when images of Victoria and Albert's bride cake (wedding cake) were circulated, but this is untrue, not least because the real boost came when images of their eldest daughter's wedding cake were published in papers such as The Illustrated London News (not founded until 1842), by which time the name had been in use for over 80 years.




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See also


Dough
Egg white
Fondant icing
Ganache
Icing (food)




References

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• Royal icing
• Icing (food)
• Fondant icing
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• Gingerbread