Directions

1Sift the sugar into the bowl of an electric mixer. Add the beaten egg white and lemon juice.

2Whisk on a low speed, so you do not incorporate too much air into the icing, for 2–3 minutes until you have a smooth, but not wet, stiff peak consistency. It should be dense and spreadable but hold a stiff peak. If it looks dry and crumbly add a little water. If it looks slightly runny and glossy, add a little extra icing sugar.

3You now have stiff peak icing for sticking houses together and placing decorations onto icing. Transfer to a bowl and cover with a damp cloth to prevent it from drying out. The icing can be prepared ahead and stored in an airtight container in the fridge for up to 1 week.

You can adjust this icing to make soft peak and flood icing:

Soft peak

1Add a drop of water at a time until you have icing that holds a soft peak but does not spread on its own. Use for piping lines, borders and decorations.

Flood icing

1Add a teaspoon of water at a time until you have a thick but runny icing that smoothes out on its own within 15 seconds but not so runny that it runs off the edge of your biscuit. Use for filling in outlined areas of biscuits.