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I made this cake and iced it at my baking class, it has 4 layers of icing! I finished it off with some piping around the edges. Always make sure your cake is covered in marizpan before starting to cover it in royal icing!
To make royal icing you need:
2 egg whites
1ml lemon juice
500g icing sugar, sieved
5ml of glycerine
Make sure you have an extremely clean bowl. Place the egg whites and lemon juice into the bowl and use a clean wooden spoon to stir the egg whites and break them up so that they mix with the lemon juice. Add some of the icing sugar and use the wooden spoon to mix together. Keep adding more icing sugar and stiring until you get the consistency you want. I usually beat it until it looks smooth and glossy. Then stir in the glycerine. This helps to keep the icing soft once the cake has been cut. Always allow the icing to rest before using it, usually for about an hour and always make sure it is covered in a damp cloth when not using otherwise it will become dry. When you are ready to use it, give it another stir as this will help to dispearse any air bubbles that may have formed!
I will do another post after Christmas about the different consistencies and other points about royal icing such as piping, flavouring and colouring it. I hope this helps you cover your christmas cake! Let the Christmas baking begin...
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