Charcoal biscuit is a biscuit

Biscuit

A biscuit is a baked, edible, and commonly flour-based product. The term is used to apply to two distinctly different products in North America and the Commonwealth Nations....

 based on a powdered willow

Willow

Willows, sallows, and osiers form the genus Salix, around 400 species of deciduous trees and shrubs, found primarily on moist soils in cold and temperate regions of the Northern Hemisphere...

 charcoal

Charcoal

Charcoal is the dark grey residue consisting of carbon, and any remaining ash, obtained by removing water and other volatile constituents from animal and vegetation substances. Charcoal is usually produced by slow pyrolysis, the heating of wood or other substances in the absence of oxygen...

 or activated carbon

Activated carbon

Activated carbon, also called activated charcoal, activated coal or carbo activatus, is a form of carbon that has been processed to make it extremely porous and thus to have a very large surface area available for adsorption or chemical reactions.The word activated in the name is sometimes replaced...

 mixed with ordinary flour

Flour

Flour is a powder which is made by grinding cereal grains, other seeds or roots . It is the main ingredient of bread, which is a staple food for many cultures, making the availability of adequate supplies of flour a major economic and political issue at various times throughout history...

, and made into dough

Dough

Dough is a paste made out of any cereals or leguminous crops by mixing flour with a small amount of water and/or other liquid. This process is a precursor to making a wide variety of foodstuffs, particularly breads and bread-based items , flatbreads, noodles, pastry, and similar items)...

 with butter

Butter

Butter is a dairy product made by churning fresh or fermented cream or milk. It is generally used as a spread and a condiment, as well as in cooking applications, such as baking, sauce making, and pan frying...

, sugar and eggs.

History

It was first made in England in the early 19th century, originally as an antidote

Antidote

An antidote is a substance which can counteract a form of poisoning. The term ultimately derives from the Greek αντιδιδοναι antididonai, "given against"....

 to flatulence

Flatulence

Flatulence is the expulsion through the rectum of a mixture of gases that are byproducts of the digestion process of mammals and other animals. The medical term for the mixture of gases is flatus, informally known as a fart, or simply gas...

 and stomach trouble. The Retrospect of Practical Medicine and Surgery, a medical text published in 1856, recommends charcoal biscuits for gastric problems, saying each biscuit contained ten grains

Grain (measure)

A grain is a unit of measurement of mass that is nominally based upon the mass of a single seed of a cereal. From the Bronze Age into the Renaissance the average masses of wheat and barley grains were part of the legal definition of units of mass. However, there is no evidence of any country ever...

 (648 mg) of charcoal. Vegetable Charcoal: Its Medicinal and Economic Properties with Practical Remarks on Its Use in Chronic Affections of the Stomach and Bowels, published in 1857, recommends charcoal biscuits as an excellent method of administering charcoal to children.

Contemporary forms

In modern times charcoal biscuits are made in the form of crackers to accompany cheeses. The biscuits have a slight hint of charcoal taste that is described by some as pleasing. The biscuits are also been marketed as a pet care product to control flatulence in pets, and as aids to digestion or stomach problem in humans.

Cultural references

In Brideshead Revisited

Brideshead Revisited

Brideshead Revisited, The Sacred & Profane Memories of Captain Charles Ryder is a novel by English writer Evelyn Waugh, first published in 1945. Waugh wrote that the novel "deals with what is theologically termed 'the operation of Grace', that is to say, the unmerited and unilateral act of love by...

, Evelyn Waugh

Evelyn Waugh

Arthur Evelyn St. John Waugh , known as Evelyn Waugh, was an English writer of novels, travel books and biographies. He was also a prolific journalist and reviewer...

 writes of Charles Ryder consuming charcoal biscuits and iced coffee

Iced coffee

Iced coffee is a cold variant of the beverage coffee.-Preparation:There are several ways of preparing iced coffee. Ordinary hot-brewed coffee can be served cold, although this may result in a bitter-tasting product. Cold brewing relies on time, rather than heat, to transfer the coffee flavor to the...

 while cramming for exams at Oxford

Oxford

The city of Oxford is the county town of Oxfordshire, England. The city, made prominent by its medieval university, has a population of just under 165,000, with 153,900 living within the district boundary. It lies about 50 miles north-west of London. The rivers Cherwell and Thames run through...

.