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Slowly melt butter and black treacle together then leave to cool.
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In a large bowl, place all the dry ingredients and mix together - a stand/hand mixer is best.
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Once the butter/treacle mix is cool, add in the whole egg and mix thoroughly.
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Add the wet ingredients to the dry and mix until well combined. Scrape down if necessary then mix on a medium speed for 1 minute. Do not add any liquid, it will come together.
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Once together, place in clingfilm and pop into the fridge for at least an hour - this helps the xanthan gum to work.
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When you are ready to roll out, knead the dough first and roll out to 3 to 4 mm - it will rise! Cut out your shapes and then pop into the freezer for 10 minutes - this helps keep the shape - than bake for 8 - 12 minutes on gas mark 5/190c (190*C). Cool completely before decorating.
To make royal icing to stick it all together, whisk and egg white until soft peaks then whisk in 200g icing sugar!