1.Beat butter and sugar in medium bowl with electric mixer until light andfluffy. Add egg yolk and brandy, beat until well combined. Stir in both almondsand sifted flours to form a soft dough (it may be easiest to do this using alow setting on an electric mixer).
2.Shape level tablespoons of mixture intocrescents; place 3cm apart onungreased baking trays. Bake crescents in moderate oven (160-170度)about 15 minutes or until browned lightly.
3.Cool shortbread on tray for 10 minutes. Sift half the extra sugar over asheet of baking paper. Transfer shortbread onto icing sugar. Sift over theremaining sugar to coat completely.
TIP Recipe can be made a week ahead; store in an airtight container.