
A custard cream is a type of biscuit popular in the British Isles. Its structure is that of a sandwich, with a creamy, custard-flavoured centre between two flat biscuit layers. Traditionally, the filling was buttercream (which is still used in home-made recipes) but nowadays cheaper fats have replaced butter in mass-produced biscuits. The filling ...
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http://en.wikipedia.org/wiki/Custard_cream

Custard cream is London Cockney rhyming slang for dream.
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http://www.probertencyclopaedia.com/browse/ZCA.HTM
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