Crush the biscuits in a whizz. Add these to a bowl with the ground ginger and crystallised ginger and mix. Melt the butter and sugar in a pot and then add the condensed milk. Combine the melted ingredients with the dry ingredients in the bowl and mix well. Press firmly and evenly into a shallow tin (10 in/26 cm x 6.5 in/16 cm) and leave in the fridge to harden. Once set cut into slices.
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