At the successful conclusion of the operation against Winifred Gillyflower, the Eleventh Doctor suggested to Jenny, Strax and Vastra that he have some Pontefract cakes on him. (TV: The Crimson Horror)
Behind the scenes 
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Unremarked in the episode is the fact that Pontefract cakes aren't cakes at all, but rather a type of liquorice sweet. The shape is cake-like, a term frequently used for round wafers.
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