Ingredients
250g unsalted butter, chopped, at room temperature
¾ cup caster sugar
3 teaspoons unicorn flavour for icing
1 egg
2 ½ cups plain flour
Blue, purple and pink food colouring
Extra plain flour, for kneading
½ cup hundreds and thousands
Method
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Grease two large oven trays and line with baking paper.
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Beat butter, sugar and flavouring in small bowl of an electric mixer until pale and creamy. Beat in egg, until combined.
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Stir in flour, in two batches, to form a soft dough. Divide evenly between three bowls. Tint each portion with a different food colouring. Knead one portion at a time on a lightly floured surface until smooth and no longer sticky.
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Roll out each portion, separately, between two sheets of baking paper into a 20cm x 25cm rectangle. Remove top sheets of baking paper from each rectangle.
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Invert blue dough over pink dough, remove top sheet of paper, then invert purple dough over the blue dough, leaving top sheet of paper in place.
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Roll out the layered dough into a 30cm x 35cm rectangle. Remove paper from top. Using the bottom sheet of paper as a guide, roll up dough firmly from the long side to form a log-shape.
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Sprinkle hundreds and thousand down the length of the log on the paper. Roll the log to coat evenly. Wrap in baking paper. Refrigerate for 45 minutes, or until firm.
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Unwrap log. Cut into 1 ½cm-thick slices. Place about 4cm apart, on prepared trays.
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Cook in a moderately slow oven (160C) for about 15 to 18 minutes or until cookies are just firm when lightly touched. Remove. Stand on trays for 10 minutes before transferring to a wire rack to cool.
