royal icing

noun

a hard white icing made from egg whites and icing sugar, used for coating and decorating cakes, esp fruit cakes

Cover them with soft royal icing; have them all of the same color.

Ornament it with dots of royal icing pressed through a pastry-bag and tube onto the edges.

Cover the top with a soft royal icing made of confectioners sugar and flavored the same as the filling.

Turn them out of the pans bottom side up, and frost the bottom and sides with royal icing while they are still warm.

Cakes iced with chocolate or with boiled icing may be ornamented with fine lines of royal icing.

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