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Heat the oven to 190C/170C fan/gas 5. Line two large baking trays with baking parchment. In a saucepan over a low heat, melt the butter, sugar, fresh ginger and golden syrup and leave to cool.
Mix the flour, ground ginger and bicarbonate of soda together in a bowl with a wooden spoon. Gradually stir in the cooled sugar mixture and the egg yolk and knead briefly to make a dough.