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Store them in a tin or other airtight container, where they will keep for up to a month.

Summary:
Mix the confectioner’s sugar, lemon juice and cream in a bowl with a whisk until all of the sugar lumps have dissolved. Spread a thin layer of icing on top of each cookie using a butter knife or cheese spreader. Allow the cookies and the icing to cool completely before you remove the cookies from the racks.