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In a bowl place the flour, sugar and salt, using your fingertips rub in the butter until you get a breadcrumb type consistency.
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To bring the mix to a dough add the milk a little at a time, add a tablespoon at a time as you don't want the dough becoming to wet.
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Bring the dough together with your hands into a ball, it should all stick together but not be wet. Wrap in cling film and place in a fridge for 20 mins to firm up.
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Roll the biscuit dough out to about 3-4mm thick between two pieces of clingfilm or greaseproof, you want to try and keep it at a rough rectangle shape.
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Once you have the thickness, scatter the currants over half of the rectangle, fold the other side over the top of the currants and re-roll until about 4mm thick.
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Cut the dough into smaller rectangle biscuits, we made about 18. Lay these on a baking tray, brush the tops with egg white and bake for 12-15 mins until golden brown in an oven preheated to gas mark 4/180c.
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Once cooked leave on the baking tray for about 5 mins to firm them transfer to a cooling rack