Combine the egg whites and confectioners' sugar in a medium-size mixing bowl and whip with an electric mixer on medium speed until opaque and shiny, about 5 minutes. Whisk in the lemon juice, this will thin out the icing. Beat for another couple of minutes until you reach the right spreading consistency for the cupcakes.
Consumption of raw or undercooked eggs, shellfish and meat may increase the risk of foodborne illness.
Recipe courtesy of Nigella Lawson(Copyright 2004, Feast, Hyperion, All Rights Reserved)