Wiktionary
n. (context British English) a biscuit consisting of a soft layer sandwiched between two crisp biscuits.
Wikipedia
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 tastes of vanilla and as such is more akin to the taste of custard made with custard powder than egg custard. It is believed that the custard cream biscuit originated in 1908. They usually have an elaborate baroque design stamped onto them, originating in the Victorian era and representing ferns.
Some British and Irish supermarkets produce own brand versions, with variations including lemon, orange, chocolate, strawberry, coffee and coconut flavours. In a 2007 poll of 7,000 Britons, 9 out of 10 voted custard creams to be their favourite biscuit. In 2009 it was ranked the eighth most popular biscuit in the UK to dunk into tea.
Usage examples of "custard cream".
I go back into the living room where my nan is asleep in her armchair, a lottery ticket in one hand and a custard cream in the other.
Neville, who had just bitten into a custard cream, choked and spat it out.
But he stubbed the cigarette out in the crumb-littered plate that had once held Quigly's custard cream pie.