Mix the fondant icing sugar with 1-2 tbsp lemon juice (from the lemon used to make the candied zest decoration) to make a thick pouring consistency. Pour the icing over the top of the cake ...

You can make your own candied lemon, if you have the time. Use a zester to peel long strips of lemon zest and place in a saucepan with a thin, even covering of sugar and a little water.