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Preheat oven to 180C (350F).
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Sieve flour and cocoa into a mixing bowl.
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Add sugar and coconut.
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Mix in vanilla extract, butter and egg. (I do the mixing in the food processor, but a wooden spoon in a big mixing bowl will do just as well).
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The mixture should now resemble moist breadcrumbs.
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Empty mixture into a shallow, greased lamington (bar) tin measuring approximately 27cm x 17cm (11" x 7").
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Using your fingers, spread mixture evenly into tin. If you need help to get it smooth on top, use the back of a spoon or roll the side of a glass over it, but don't press down too hard. It doesn't have to be perfectly smooth.
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Now bake in the oven for 10-15 minutes until slightly firm.
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While it's baking, make the icing sugar by combining all the ingredients in a bowl and beating with an electric mixer.
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While the slice is still warm, spoon over icing and smooth out evenly.
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Allow it to cool a little more and then sprinkle over some more coconut and, if you like, decorate with glace cherries.
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While still warm-ish, cut into squares, but don't remove the squares until it's completely cool.