Beat butter until fluffy, then stir in the sugar. Add almonds and sieve in flour and baking powder. Work into a dough, cover and chill for 1 hour.
Grease a baking tray and preheat oven to 180 C / Gas 4. Flour a work surface and roll out the dough on it. Cut out stars and place on the prepared baking tray. Bake in preheated oven for about 10-12 minutes.
Let biscuits cool. Meanwhile, mix just enough icing sugar and lemon juice to make a smooth icing. Coat cooled biscuits with the icing and sprinkle over desiccated coconut.