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Heat oven to 200C/180C fan/gas 6. Melt the butter in a small pan, then allow to cool slightly. Tip all the dry ingredients into a bowl, with ½ tsp salt, then pour in the butter. Add 5-6 tbsp boiling water and combine to make a firm dough.
Turn out the dough onto a lightly floured surface, then roll out until about 0.5cm thick. Cut into small squares, then bake for 12-15 mins until golden. Leave to cool for a few mins, then transfer to a wire rack and cool completely.