Roasted barley tea is a caffeine

Caffeine

Caffeine is a bitter, white crystalline xanthine alkaloid that acts as a stimulant drug. Caffeine is found in varying quantities in the seeds, leaves, and fruit of some plants, where it acts as a natural pesticide that paralyzes and kills certain insects feeding on the plants...

-free, roasted-grain

Roasted grain beverage

A roasted grain beverage is a hot beverage made from one or more cereal grains roasted and commercially processed into crystal or powder form to be reconstituted later in hot water. The product is often marketed as a caffeine-free alternative to coffee and tea....

-based tisane

Tisane

A herbal tea, tisane, or ptisan is a herbal or plant infusion and usually not made from the leaves of the tea bush . Typically, herbal tea is simply the combination of boiling water and dried fruits, flowers or herbs. Herbal tea has been imbibed for nearly as long as written history extends...

 made from barley

Barley

Barley is a major cereal grain, a member of the grass family. It serves as a major animal fodder, as a base malt for beer and certain distilled beverages, and as a component of various health foods...

, which is popular in Japanese

Japanese cuisine

Japanese cuisine has developed over the centuries as a result of many political and social changes throughout Japan. The cuisine eventually changed with the advent of the Medieval age which ushered in a shedding of elitism with the age of shogun rule...

, Chinese

Chinese cuisine

Chinese cuisine is any of several styles originating in the regions of China, some of which have become highly popular in other parts of the world – from Asia to the Americas, Australia, Western Europe and Southern Africa...

, and Korean cuisine. It is also used as a caffeine

Caffeine

Caffeine is a bitter, white crystalline xanthine alkaloid that acts as a stimulant drug. Caffeine is found in varying quantities in the seeds, leaves, and fruit of some plants, where it acts as a natural pesticide that paralyzes and kills certain insects feeding on the plants...

-free coffee substitute

Coffee substitute

Coffee substitutes are non-coffee products, usually without caffeine, that are used to imitate coffee. Coffee substitutes can be used for medical, economic and religious reasons, or simply because coffee is not readily available. Roasted grain beverages are common substitutes for coffee.In World...

 in American cuisine

Cuisine of the United States

American cuisine is a style of food preparation originating from the United States of America. European colonization of the Americas yielded the introduction of a number of ingredients and cooking styles to the latter...

. Barley water

Barley water

Barley water, usually flavoured with lemon or other fruit, is a traditional British soft drink. It is made by boiling washed pearl barley, straining, then pouring the hot water over the rind and/or pulp of the fruit, and adding fruit juice and sugar to taste. The rind may also be boiled with the...

 is a popular traditional soft drink in Britain

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

.

Roasted barley tea is called in Japanese, dàmàichá (大麦茶) or màichá (麦茶 or 麥茶) in Mandarin Chinese, and boricha (보리차) in Korean

Korean language

Korean is the official language of the country Korea, in both South and North. It is also one of the two official languages in the Yanbian Korean Autonomous Prefecture in People's Republic of China. There are about 78 million Korean speakers worldwide. In the 15th century, a national writing...

. While the tea is generally regarded as a cooling summer beverage in Japan, it is served year-round, hot in winter and cold in summer, in Korea. Originally, roasted barley seeds were stewed in hot water (this is still the method generally used in Korea), but tea bag

Tea bag

A tea bag is a small, porous sealed bag containing tea leaves and used for brewing tea. Tea bags are commonly made of paper, silk or plastic. The bag contains the tea leaves while the tea is brewed, making it easier to dispose of the leaves, and performs the same function as a tea infuser...

s containing ground barley became more popular during the early 1980s; this is now the norm in Japan. It can be found from many different distributors in vending machine

Vending machine

A vending machine is a machine which dispenses items such as snacks, beverages, alcohol, cigarettes, lottery tickets, consumer products and even gold and gems to customers automatically, after the customer inserts currency or credit into the machine....

s all over Japan.

In Korea, roasted unhulled barley is used to prepare the tea. Often the barley is combined with oksusu cha

Oksusu cha

Oksusu cha is a traditional Korean tisane made from boiled roasted corn kernels.The variety of corn most often used is called Gang-naeng-i , which is usually grown in the area of Gangneung, a city in the Gangwon province on South Korea's eastern coast, thus making this drink particularly popular...

(roasted corn

Maize

Maize known in many English-speaking countries as corn or mielie/mealie, is a grain domesticated by indigenous peoples in Mesoamerica in prehistoric times. The leafy stalk produces ears which contain seeds called kernels. Though technically a grain, maize kernels are used in cooking as a vegetable...

 infusion), as the corn's sweetness offsets the slightly bitter flavor of the barley. A similar drink, made from roasted brown rice, is called hyeonmi cha

Hyeonmi cha

Hyeonmi cha is a tisane made from roasted brown rice.To make hyeonmi cha, brown rice is washed, then roasted in a pot. Then water is poured into the pot, brought to a boil, and then simmered for approximately ten minutes...

(tisane) or genmaicha

Genmaicha

is the Japanese name for green tea combined with roasted brown rice. It is sometimes referred to colloquially as "popcorn tea" because a few grains of the rice pop during the roasting process and resemble popcorn...

(with green tea

Green tea

Green tea is made solely from the leaves of Camellia sinensis that have undergone minimal oxidation during processing. Green tea originates from China and has become associated with many cultures throughout Asia. It has recently become more widespread in the West, where black tea is traditionally...

 added).

Roasted barley tea, sold in ground form and sometimes combined with chicory

Chicory

Common chicory, Cichorium intybus, is a somewhat woody, perennial herbaceous plant usually with bright blue flowers, rarely white or pink. Various varieties are cultivated for salad leaves, chicons , or for roots , which are baked, ground, and used as a coffee substitute and additive. It is also...

 or other ingredients, is also sold as a coffee substitute

Coffee substitute

Coffee substitutes are non-coffee products, usually without caffeine, that are used to imitate coffee. Coffee substitutes can be used for medical, economic and religious reasons, or simply because coffee is not readily available. Roasted grain beverages are common substitutes for coffee.In World...

.

Research

Roasted barley tea was found to inhibit bacterial colonization and adhesion, specifically to the major cause of tooth decay and implicated in cardiovascular diseases, Streptococcus mutans

Streptococcus mutans

Streptococcus mutans is a facultatively aerobic, Gram-positive coccus-shaped bacterium commonly found in the human oral cavity and is a significant contributor to tooth decay.The microbe was first described by J Kilian Clarke in 1924.-Introduction:...

 biofilms. It also lowers blood viscosity

Blood viscosity

Blood viscosity is a measure of the resistance of blood to flow, which is being deformed by either shear or extensional strain.Blood is a liquid that consists of plasma and particles, such as the red blood cells. The viscosity of blood thus depends on the viscosity of the plasma, in combination...

, proportional to the level of alkylpyrazine

Alkylpyrazine

Alkylpyrazines are chemical compounds based on pyrazine with different substitution patterns. Some alkylpyrazines are naturally occurring highly aromatic substances which often have a very low odor threshold and contribute to the taste and aroma of various foods including coffee and wines. ...

in the tea.