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1. Preheat the oven to 180°C (160°C for fan ovens), Gas Mark 4. Line 2 baking sheets with parchment.
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2. Beat the butter, sugar and condensed milk together until creamy. Add the egg (don’t worry if it looks like its curdling), beat well and then add the flours, spice and lemon zest. Mix to a firm but sticky dough. Cover in cling film and refrigerate for 30 minutes.
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3. Roll the dough out on a well- floured surface to the thickness of a pound coin. Cut shapes out. Transfer the biscuit shapes to the trays and bake for 10 minutes until light golden. Cool completely on a wire rack.
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4. Ice and decorate the biscuits if you like – then leave to dry slightly. Store in an airtight box for up to a week.
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Why not make a plain base and add vanilla and roll in some chocolate chips to your dough for a chocolaty version!