Dunking (biscuit)

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Dunking a biscuit

To dunk or to dip a biscuit (or cookie) or some other food means to submerge it into a beverage, especially tea, coffee, or milk. Dunking releases more flavour from confections by dissolving the sugars,[1] while also softening their texture. Dunking can be used to melt chocolate on biscuits to create new, rich flavours which have not been tasted before.

Dunking is a popular way of enjoying biscuits in many countries. A popular form of dunking in Australia is the "Tim Tam Slam", also known as 'tea sucking'.[2] The physics of dunking is driven by the porosity of the biscuit and the surface tension of the beverage. A biscuit is porous and, when dunked, capillary action draws the liquid into the interstices between the crumbs.[3]

Dunking is first reported with ancient Romans softening their hard unleavened wafers (in Latin "bis coctum": twice baked) in wine.[3] It became popular in the United States with the creation in East Hanover, New Jersey of the Oreo in 1912 an entire year before Marcel Proust's mention of the act[citation needed]. The Oreo company's main tone of their television adverts is a person, usually children, enjoying dunking an Oreo.

The most popular biscuit to dunk in the United Kingdom is the chocolate digestive.[4]

In South Africa and in India, rusks are a popular food for dunking in both tea and coffee.

Dunking is also used as a slang term for intinction: the Eucharistic practice of partly dipping the consecrated bread, or host, into the consecrated wine, by the officiant before distributing.

Biscuit dunking, etiquette and style[edit]

Different cultures have different attitudes toward biscuit dunking. Historically in British high society, dunking was frowned upon and generally seen as children's or working class' fashion. Opinion has changed over the years but continues to divide opinion, with one tea room outlawing dunking on its premises[5] while a Michelin starred restaurateur publicly advocates the act.[6]

Biscuit dunking and science[edit]

Physicist Len Fisher of the University of Bristol presented some light-hearted discussion of dunking on "National Biscuit Dunking Day", as part of an attempt to make physics accessible. Fisher appeared to be somewhat taken aback by the large amount of media attention, ascribing it to a "hunger for accessible science". Fisher also described his astonishment at journalists' interest in one equation used in the field: Washburn's equation, which describes capillary flow in porous materials. Writing in Nature, he says "the equation was published in almost every major UK newspaper. The journalists who published it took great care to get it right, some telephoning several times to check".[7][8]

Cultural references[edit]

In Marcel Proust's novel In Search of Lost Time one of the narrator's childhood memories sets in while tasting a madeleine dunked in tea. The soft, spongy consistency of the madeleine could seem like an odd choice as dunking is more common with crisp baked products, such as biscuits. In fact, draft versions of Proust's manuscript reveal that the author initially had the narrator dunk a piece of toasted bread.[9]

In the film The Best Exotic Marigold Hotel, Evelyn Greenslade, one of the main characters, explains to her new employer during an interview whilst drinking Builder's tea. Evelyn, quite poetically describes it as "lowering the biscuit into the tea and letting it soak in there and trying to calculate the exact moment before the biscuit dissolves, when you whip it up into your mouth and enjoy the blissful union of biscuits and tea combined."[10]

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