Chocolate is a food made from roasted and ground cocoa beans that can be a liquid, solid, or paste, either on its own or as a flavoring in other foods. The cacao tree has been used as a source of food for at least 5,300 years, starting with the Mayo-Chinchipe culture in what is present-day Ecuador. Later, Mesoamerican civilizations consumed cacao beverages, of which one, chocolate, was introduced to Europe in the 16th century.
The seeds of the cacao tree (Theobroma cacao) have an intense bitter taste and must be fermented to develop the flavor. After fermentation, the seeds are dried, cleaned, and roasted. The shell is removed to produce nibs, which are then ground to cocoa mass, unadulterated chocolate in rough form. Once the cocoa mass is liquefied by heating, it is called chocolate liquor. The liquor may also be cooled and processed into its two components: cocoa solids and cocoa butter. Baking chocolate, also called bitter chocolate, contains cocoa solids and cocoa butter in varying proportions without any added sugar. Powdered baking cocoa, which contains more fiber than cocoa butter, can be processed with alkali to produce Dutch cocoa. Much of the chocolate consumed today is in the form of sweet chocolate, a combination of cocoa solids, cocoa butter, and added vegetable oils and sugar. Milk chocolate is sweet chocolate that additionally contains milk powder. White chocolate contains cocoa butter, sugar, and milk, but no cocoa solids.
Chocolate is one of the most popular food types and flavors in the world, and many foodstuffs involving chocolate exist, particularly desserts, including cakes, pudding, mousse, brownies, and chocolate chip cookies. Many candies are filled with or coated with sweetened chocolate. Chocolate bars, either made of solid chocolate or other ingredients coated in chocolate, are eaten as snacks. Gifts of chocolate molded into different shapes (such as eggs, hearts, and coins) are traditional on certain Western holidays, including Christmas, Easter, Valentine's Day, and Hanukkah. Chocolate is also used in cold and hot beverages, such as chocolate milk and hot chocolate, and in some alcoholic drinks, such as crème de cacao.
Although cocoa originated in the Americas, West African countries, particularly Ivory Coast and Ghana, are the leading producers of cocoa in the 21st century, accounting for some 60% of the world cocoa supply. A 2020 report estimated that more than 1.5 million children are involved in the farming of cocoa in Côte d'Ivoire and Ghana.[1] Child slavery and trafficking associated with the cocoa trade remain major concerns. A 2018 report argued that international attempts to improve conditions for children were doomed to failure because of persistent poverty, the absence of schools, increasing world cocoa demand, more intensive farming of cocoa, and continued exploitation of child labor.
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Cocoa is a variant of cacao, likely due to confusion with the word coco.[2] It is ultimately derived from kakaw(a), but whether that word originates in Nahuatl or a Mixe-Zoquean language is the subject of substantial linguistic debate.[2][3] Chocolate is a Spanish loanword, first recorded in English in 1604,[4] and first recorded in Spanish in 1579.[5] The word for chocolate drink in early Nahuatl texts is cacahuatl meaning "cacao water", which chocolate does not immediately derive from.[6]
Despite theories that chocolate is derived from xocoatl meaning "bitter drink" or chocolatl meaning "hot water"[7][8] and uncertainty around the Nahuatl origin, there is a consensus that it likely derives from chicolatl.[9] Whether chicolatl means "cacao beater", however, is contested, due to difficulty knowing what chico means.[10]
The term "chocolatier", for a chocolate confection maker, is recorded from 1859.[11]
Evidence for the domestication of the cacao tree exists as early as 5300 BP in South America, before it was introduced to Mesoamerica.[12] It is unknown when chocolate was first consumed as opposed to other cacao-based drinks, and there is evidence the Olmecs, the earliest known major Mesoamerican civilization, fermented the sweet pulp surrounding the cacao beans into an alcoholic beverage.[13][14] Chocolate was extremely important to several Mesoamerican societies,[15] and cacao was considered a gift from the gods by the Mayans and the Aztecs.[16][17] The cocoa bean was used as a currency across civilizations and was used in ceremonies, as a tribute to leaders and gods and as a medicine.[18][19][20][21][22][23] Chocolate in Mesoamerica was a bitter drink, flavored with additives such as vanilla, earflower and chili, and was capped with a dark brown foam created by pouring the liquid from a height between containers.[24][25][26]
While Spanish conquistador Hernán Cortés may have been the first European to encounter chocolate when he observed it in the court of Moctezuma II in 1520,[27][28] it proved to be an acquired taste,[29][30] and it took until 1585 for the first official recording of a shipment of cocoa beans to Europe.[31] Chocolate was believed to be an aphrodisiac and medicine, and spread across Europe in the 17th century, sweetened, served warm and flavored with familiar spices.[32][33][34] It was initially primarily consumed by the elite, with expensive cocoa supplied by colonial plantations in the Americas.[32] In the 18th century, it was considered southern European, aristocratic and Catholic and was still produced in a similar way to the way it had been produced by the Aztecs.[35]
Starting in the 18th century, chocolate production was improved. In the 19th century, engine-powered milling was developed,[38][39] and in 1828, Coenraad Johannes van Houten received a patent for a process making Dutch cocoa. This removed cocoa butter from chocolate liquor (the product of milling), and permitted large scale production of chocolate.[40] Other developments in the 19th century, including the melanger (a mixing machine), modern milk chocolate, the conching process to make chocolate smoother and change the flavor meant a worker in 1890 could produce fifty times more chocolate with the same labor than they could before the Industrial Revolution, and chocolate became a food to be eaten rather than drunk.[41] As production moved from the Americas to Asia and Africa, mass markets in Western nations for chocolate opened up.[42]
In the early 20th century, British chocolate producers including Cadbury and Fry's faced controversy over the labor conditions in the Portuguese cacao industry in Africa. A 1908 report by a Cadbury agent described conditions as "de facto slavery."[43] While conditions somewhat improved with a boycott by chocolate makers,[39][44] slave labor among African cacao growers again gained public attention in the early 21st century.[45] During the 20th century, chocolate production further developed, with development of the tempering technique to improve the snap and gloss of chocolate and the addition of lecithin to improve texture and consistency.[46][47] White and couverture chocolate were developed in the 20th century and the bean-to-bar trade model began.[48][49][50]
Several types of chocolate can be distinguished. Pure, unsweetened chocolate, often called "baking chocolate", contains primarily cocoa solids and cocoa butter in varying proportions. Much of the chocolate consumed today is in the form of sweet chocolate, which combines chocolate with sugar.
The traditional types of chocolate are dark, milk and white. All of them contain cocoa butter, which is the ingredient defining the physical properties of chocolate (consistency and melting temperature). Plain (or dark) chocolate, as it name suggests, is a form of chocolate that is similar to pure cocoa liquor, although is usually made with a slightly higher proportion of cocoa butter.[51] It is simply defined by its cocoa percentage. In milk chocolate, the non-fat cocoa solids are partly or mostly replaced by milk solids.[52] In white chocolate, they are all replaced by milk solids, hence its ivory color.[53]
Other forms of eating chocolate exist, these include raw chocolate (made with unroasted beans) and ruby chocolate. An additional popular form of eating chocolate, gianduja, is made by incorporating nut paste (typically hazelnut) to the chocolate paste.[54]
Other types of chocolate are used in baking and confectionery. These include baking chocolate (often unsweetened), couverture chocolate (used for coating), compound chocolate (a lower-cost alternative) and modeling chocolate. Modeling chocolate is a chocolate paste made by melting chocolate and combining it with corn syrup, glucose syrup, or golden syrup.[55]
Chocolate is made from cocoa beans, the dried and fermented seeds of the cacao tree (Theobroma cacao), a small, 4–8 m tall (15–26 ft tall) evergreen tree native to the deep tropical region of the Americas.
Recent genetic studies suggest the most common genotype of the plant originated in the Amazon basin and was gradually transported by humans throughout South and Central America. Early forms of another genotype have also been found in what is now Venezuela. The scientific name, Theobroma, means "food of the gods".[56] The fruit, called a cocoa pod, is ovoid, 15–30 cm (6–12 in) long and 8–10 cm (3–4 in) wide, ripening yellow to orange, and weighing about 500 g (1.1 lb) when ripe.
Cacao trees are small, understory trees that need rich, well-drained soils. They naturally grow within 20° of either side of the equator because they need about 2000 mm of rainfall a year, and temperatures in the range of 21 to 32 °C (70 to 90 °F). Cacao trees cannot tolerate a temperature lower than 15 °C (59 °F).[57]
The sequencing in 2010 of the genome of the cacao tree may allow yields to be improved.[58] Due to concerns about global warming effects on lowland climate in the narrow band of latitudes where cocoa is grown (20 degrees north and south of the equator), the commercial company Mars, Incorporated and the University of California, Berkeley, are conducting genomic research in 2017–18 to improve the survivability of cacao plants in hot climates.[59]
The three main varieties of cocoa beans used in chocolate are criollo, forastero, and trinitario.
Cocoa pods are harvested by cutting them from the tree using a machete, or by knocking them off the tree using a stick. It is important to harvest the pods when they are fully ripe, because if the pod is unripe, the beans will have a low cocoa butter content, or low sugar content, reducing the ultimate flavor.
The beans (which are sterile within their pods) and their surrounding pulp are removed from the pods and placed in piles or bins to ferment. Micro-organisms, present naturally in the environment, ferment the pectin-containing material. Yeasts produce ethanol, lactic acid bacteria produce lactic acid, and acetic acid bacteria produce acetic acid. In some cocoa-producing regions an association between filamentous fungi and bacteria (called "cocobiota") acts to produce metabolites beneficial to human health when consumed.[60] The fermentation process, which takes up to seven days, also produces several flavor precursors, that eventually provide the chocolate taste.[61]
After fermentation, the beans must be dried to prevent mold growth. Climate and weather permitting, this is done by spreading the beans out in the sun from five to seven days.[62] In some growing regions (for example, Tobago), the dried beans are then polished for sale by "dancing the cocoa": spreading the beans onto a floor, adding oil or water, and shuffling the beans against each other using bare feet.[63]
In an alternative process known as moist incubation, the beans are dried without fermentation. The nibs are then removed and hydrated in an acidic solution. They are heated for 72 hours and dried again. Gas chromatography/mass spectrometry showed that the incubated chocolate had higher levels of Strecker aldehydes, and lower levels of pyrazines.[64][65]
The dried beans are then transported to a chocolate manufacturing facility. The beans are cleaned (removing twigs, stones, and other debris), roasted, and graded. Next, the shell of each bean is removed to extract the nib. The nibs are ground and liquefied, resulting in pure chocolate liquor.[66] The liquor can be further processed into cocoa solids and cocoa butter.[67]
Producers of high-quality, small-batch chocolate argue that mass production produces bad-quality chocolate.[68] Some mass-produced chocolate contains much less cocoa (as low as 7% in many cases), and fats other than cocoa butter. Vegetable oils and artificial vanilla flavor are often used in cheaper chocolate to mask poorly fermented and/or roasted beans.[68]
The penultimate process is called conching. A conche is a container filled with metal beads, which act as grinders. The refined and blended chocolate mass is kept in a liquid state by frictional heat. Chocolate before conching has an uneven and gritty texture. The conching process produces cocoa and sugar particles smaller than the tongue can detect (typically around 20 μm) and reduces rough edges, hence the smooth feel in the mouth. The length of the conching process determines the final smoothness and quality of the chocolate. High-quality chocolate is conched for about 72 hours, and lesser grades about four to six hours. After the process is complete, the chocolate mass is stored in tanks heated to about 45 to 50 °C (113 to 122 °F) until final processing.[69]
After conching, chocolate is tempered. This process aims to create a crystallize a small amount of fat in a particularly stable formation. Around this small amount of crystals, the rest of the fats crystallize, creating a glossy chocolate, with a crisp break.[70][71]
Chocolate is molded in different shapes for different uses:[72]