Popcorn (also called popped corn, popcorns, or pop-corn) is a variety of cornkernel which expands and puffs up when heated. The term also refers to the snack food produced by the expansion. It is one of the oldest snacks, with evidence of popcorn dating back thousands of years in the Americas. It is commonly eaten salted, sweetened, or with artificial flavorings.
A popcorn kernel's strong hull contains the seed's hard, starchy shell endosperm with 14–20% moisture, which turns to steam as the kernel is heated. Pressure from the steam continues to build until the hull ruptures, allowing the kernel to forcefully expand, to 20 to 50 times its original size, and then cool.[1]
Corn was domesticated about 10,000 years ago, in what is now Mexico.[3] Archaeologists discovered that people have known about popcorn for thousands of years. Fossil evidence from Peru suggests that corn was present there as early as 4700 BCE, and popped there over 1000 years ago.[4][5][6] Between 2007 and 2011, evidence, as early as 4700 BCE, for popping corn, as macrofossil cobs, were discovered at the Paredones and Huaca Prieta archaeological sites on the northern coast of Peru.[7] In 1948 and 1950, evidence, as early as 3600 BCE, for popping corn, as ears of popcorn, were discovered by Harvard anthropology graduate student Herbert W. Dick[8] and Harvard botany graduate student Claude Earle Smith, Junior (1922-1987),[9][10] in a complex of rock shelters, dubbed the "Bat Cave", in Catron County,[11] west-central New Mexico, and attributed to the Ancestral Puebloan peoples, who maintained trade networks with peoples in tropical Mexico.[4][12][13][14][15][16][17][18]
Through the 19th century, popping of the kernels was achieved by hand, on stove tops over flame. Kernels were sold on the East Coast of the United States under names such as Pearls or Nonpareil. The term popped corn first appeared in John Russell Bartlett's 1848 Dictionary of Americanisms.[19][20] Popcorn is an ingredient in Cracker Jack and, in the early years of the product, it was popped by hand.[19]
An early popcorn machine in a street cart, invented in the 1880s by Charles Cretors in Chicago.
Popcorn's accessibility increased rapidly in the 1890s with Charles Cretors' invention of the popcorn maker. Cretors, a Chicago candy store owner, had created a number of steam-powered machines for roasting nuts and applied the technology to the corn kernels.
By the turn of the century, Cretors had created and deployed street carts equipped with steam-powered popcorn makers.[21]
Specimen of Zea mays everta
During the Great Depression, popcorn was fairly inexpensive at 5–10 cents a bag and became popular. Thus, while other businesses failed, the popcorn business thrived and became a source of income for many struggling farmers and entrepreneurs, including the Redenbacher family, namesake of the Orville Redenbacher's popcorn brand. During World War II, sugar rations diminished candy production, and Americans compensated by eating three times as much popcorn as they had before.[22] The snack was popular at theaters, much to the initial displeasure of many of the theater owners, who thought it distracted from the films. Their minds eventually changed, however, and in 1938 a Midwestern theater owner named Glen W. Dickinson Sr. installed popcorn machines in the lobbies of his Dickinson theaters. Popcorn was more profitable than theater tickets, and at the suggestion of his production consultant, R. Ray Aden, Dickinson purchased popcorn farms and was able to keep ticket prices down. The venture was a success, and popcorn soon spread.[19] The rise of television in the 1940s brought lower popcorn consumption as theater attendance fell. The Popcorn Institute (a trade association of popcorn processors) promoted popcorn consumption at home, bringing it back to previous levels.[23]
An ear of popcorn grown in an Oklahoma organic garden
Each kernel of popcorn contains moisture and oil. Unlike most other grains, the outer hull of the popcorn kernel is strong and impervious to moisture, and the starch inside consists almost entirely of a hard type.[27]
The sequence of a kernel popping
As the oil and water in the kernel are heated, they turn into steam. Under these conditions, the starch inside the kernel gelatinizes and softens. The steam pressure increases until the breaking point of the hull is reached; a pressure of approximately 930kPa (135psi)[1][27] and a temperature of 180°C (356°F). The hull ruptures, causing a sudden drop in pressure inside the kernel and a corresponding rapid expansion of the steam, which expands the starch and proteins of the endosperm into airy foam. As the foam rapidly cools, the starch and protein polymers set into the familiar crispy puff.[27]
Special varieties are grown to improve popping yield. Though the kernels of some other types will pop, the cultivated strain for popcorn is Zea mays everta, which is a variety of flint corn.[citation needed]
Cooking methods
An in-home hot-air popcorn makerA commercial pop corn making machine
Popcorn can be cooked with butter or oil. Although small quantities can be popped in a stove-top kettle or pot in a home kitchen, commercial sale employs specially designed popcorn machines, which were invented in Chicago, Illinois, by Charles Cretors in 1885. Cretors introduced his invention at the Columbian Exposition in 1893. At that fair, F. W. Rueckheim introduced a molasses-flavored "Candied Popcorn", the first caramel corn; his brother, Louis Ruekheim, slightly altered the recipe and introduced it as Cracker Jack in 1896.[28]
Popcorn being cooked in a pan
Cretors's invention was the first patented steam-driven machine that popped corn in oil. Previously, vendors popped corn by holding a wire basket over an open flame. At best, the result was hot, dry, and unevenly cooked. Cretors's machine popped corn in a mixture of one-third clarified butter, two-thirds lard, and salt. This mixture can withstand the 232°C (450°F) temperature needed to pop corn and produces little smoke. A fire under a boiler created steam that drove a small engine to drive gears, shaft, and the agitator that stirred the corn, and also powered a small puppet, "The Toasty Roasty Man", an attention-getting amusement to attract business. A wire connected to the top of the cooking pan allowed the operator to disengage the drive mechanism, lift the cover, and dump popped corn into the storage bin beneath. Exhaust from the steam engine was piped to a pan below the corn storage bin and kept freshly popped corn warm. Excess steam was also used to operate a small, shrill whistle to attract attention.[29]
A different method of popcorn-making involves the "popcorn hammer", a large cast-iron canister that is sealed with a heavy lid and slowly turned over a fire in rotisserie fashion.
Expansion and yield
Popping results are sensitive to the rate at which the kernels are heated. If heated too quickly, the steam in the outer layers of the kernel can reach high pressures and rupture the hull before the starch in the center of the kernel can fully gelatinize, leading to partially popped kernels with hard centers. Heating too slowly leads to entirely unpopped kernels: the tip of the kernel, where it attached to the cob, is not entirely moisture-proof, and when heated slowly, the steam can leak out of the tip fast enough to keep the pressure from rising sufficiently to break the hull and cause the pop.[30]
Producers and sellers of popcorn consider two major factors in evaluating the quality of popcorn: what percentage of the kernels will pop, and how much each popped kernel expands. Expansion is an important factor to both the consumer and vendor. For the consumer, larger pieces of popcorn tend to be more tender and are associated with higher quality. For the grower, distributor and vendor, expansion is closely correlated with profit: vendors such as theaters buy popcorn by weight and sell it by volume. For these reasons, higher-expansion popcorn fetches a higher profit per unit weight.[citation needed]
Popcorn will pop when freshly harvested, but not well; its high moisture content leads to poor expansion and chewy pieces of popcorn. Kernels with a high moisture content are also susceptible to mold when stored. For these reasons, popcorn growers and distributors dry the kernels until they reach the moisture level at which they expand the most. This differs by variety and conditions, but is generally in the range of 14–15% moisture by weight. If the kernels are over-dried, the expansion rate will suffer and the percentage of kernels that pop will decline. Old popcorn tends to dry out, lowering the yield.[citation needed]
When the popcorn has finished popping, sometimes unpopped kernels remain. Known in the popcorn industry as "old maids",[31] these kernels fail to pop because they do not have enough moisture to create enough steam for an explosion. Re-hydrating prior to popping usually results in eliminating the unpopped kernels.[citation needed]
Popcorn varieties are broadly categorized by the shape of the kernels, the color of the kernels, or the shape of the popped corn. While the kernels may come in a variety of colors, the popped corn is always off-yellow or white as it is only the hull (or pericarp) that is colored. "Rice" type popcorn have a long kernel pointed at both ends; "pearl" type kernels are rounded at the top. Commercial popcorn production has moved mostly to pearl types.[32] Historically, pearl popcorn were usually yellow and rice popcorn usually white. Today both shapes are available in both colors, as well as others including black, red, mauve, purple, and variegated. Mauve and purple popcorn usually have smaller and nutty kernels. Commercial production is dominated by white and yellow.[33]
Terminology
"Mushroom"-shaped popcorn, left, is less fragile and less tender than "butterfly"-shaped, right.
In the popcorn industry, a popped kernel of corn is known as a "flake". Two shapes of flakes are commercially important. "Butterfly" (or "snowflake")[34] flakes are irregular in shape and have a number of protruding "wings". "Mushroom" flakes are largely ball-shaped, with few wings. Butterfly flakes are regarded as having better mouthfeel, with greater tenderness and less noticeable hulls. Mushroom flakes are less fragile than butterfly flakes and are therefore often used for packaged popcorn or confectionery, such as caramel corn.[33] The kernels from a single cob of popcorn may form both butterfly and mushroom flakes; hybrids that produce 100% butterfly flakes or 100% mushroom flakes exist, the latter developed only as recently as 1998.[33]
Consumption
Popcorn grown in Mozambique and sold in the marketplace
Popcorn is a popular snack food at sporting events and in movie theaters, where it has been served since the 1930s.[35] Cinemas have come under fire due to their high markup on popcorn; Stuart Hanson, a film historian at De Montfort University in Leicester, once said, "One of the great jokes in the industry is that popcorn is second only to cocaine or heroin in terms of profit."[36]
Traditions differ as to whether popcorn is consumed as a hearty snack food with salt (predominating in the United States) or as a sweet snack food with caramelized sugar (predominating in Germany).[citation needed]
Movie theater popcorn in a bucket
Popcorn smell has an unusually attractive quality for human beings. This is largely because it contains high levels of the chemicals 6-acetyl-2,3,4,5-tetrahydropyridine and 2-acetyl-1-pyrroline, very powerful aroma compounds that are also used by food and other industries either to make products that smell like popcorn, bread, or other foods containing the compound in nature, or for other purposes.[citation needed]
A bag of popcorn.
Popcorn as a breakfast cereal was consumed by Americans in the 1800s and generally consisted of popcorn with milk and a sweetener.[37]
Gangnaengi, Korean popcorn
Popcorn balls (popped kernels stuck together with a sugary "glue") were hugely popular around the turn of the 20th century, but their popularity has since waned. Popcorn balls are still served in some places as a traditional Halloween treat. Cracker Jack is a popular, commercially produced candy that consists of peanuts mixed in with caramel-covered popcorn. Kettle corn is a variation of normal popcorn, cooked with white sugar and salt, traditionally in a large copper kettle. Once reserved for specialty shops and county fairs, kettle corn has recently become popular, especially in the microwave popcorn market. The popcorn maker is a relatively new home appliance, and its popularity is increasing because it offers the opportunity to add flavors of the consumer's own choice and to choose healthy-eating popcorn styles.[citation needed]
Popped sorghum is popular as a snack in India. The popped sorghum is similar to popcorn, but the puffs are smaller. Recipes for popping sorghum by microwave, in a pot, etc., are readily available online.
Movie theaters commonly use coconut oil to pop the corn, and then top it with butter or margarine.[40] Movie theater popcorn contains large amounts of saturated fats and sodium due to its method of preparation.[40]
Microwaveable popcorn represents a special case, since it is designed to be cooked along with its various flavoring agents. One of these formerly common artificial-butter flavorants, diacetyl, has been implicated in causing respiratory illnesses in microwave popcorn factory workers, also known as "popcorn lung". Major manufacturers in the United States have stopped using this chemical, including Orville Redenbacher's, Act II, Pop Secret and Jolly Time.[citation needed][44][45]
Some shipping companies have experimented with using popcorn as a biodegradable replacement for expanded polystyrene packing material. However, popcorn has numerous undesirable properties as a packing material, including attractiveness to pests, flammability, and a higher cost and greater density than expanded polystyrene. A more processed form of expanded corn foam has been developed to overcome some of these limitations, forming starch-based foam peanuts.[49]
Porridge is a food made by heating or boiling ground, crushed or chopped starchy plants, typically grain, in milk or water. It is often cooked or served with added flavourings such as sugar, honey, fruit, or syrup to make a sweet cereal, or it can be mixed with spices, meat, or vegetables to make a savoury dish. It is usually served hot in a bowl, depending on its consistency. Oat porridge, or oatmeal, is one of the most common types of porridge. Gruel is a thinner version of porridge and congee is a savoury variation of porridge of Asian origin.
Sweet corn, also called sweetcorn, sugar corn and pole corn, is a variety of corn grown for human consumption with a high sugar content. Sweet corn is the result of a naturally occurring recessive mutation in the genes which control conversion of sugar to starch inside the endosperm of the corn kernel. Sweet corn is picked when still immature and prepared and eaten as a vegetable, rather than field corn, which is harvested when the kernels are dry and mature. Since the process of maturation involves converting sugar to starch, sweet corn stores poorly and must be eaten fresh, canned, or frozen, before the kernels become tough and starchy.
Cracker Jack is an American brand of snack food that consists of molasses-flavored, caramel-coated popcorn and peanuts, well known for being packaged with a prize of trivial value inside. The Cracker Jack name and slogan, "The More You Eat, The More You Want," were registered in 1896. Food author Andrew F. Smith has called it the first junk food.
Orville Clarence Redenbacher was an American food scientist and businessman most often associated with the brand of popcorn that bears his name which is now owned by Conagra Brands. The New York Times described him as "the agricultural visionary who all but single-handedly revolutionized the American popcorn industry".
Puffed grains are grains that have been expanded ("puffed") through processing. They have been made for centuries with the simplest methods like popping popcorn. Modern puffed grains are often created using high temperature, pressure, or extrusion.
Kettle corn is a sweet-and-savory variety of popcorn that is typically mixed or seasoned with a light-colored refined sugar, salt, and oil. It was traditionally made in cast iron kettles, hence the name, but in modern times other types of pots and pans are used.
Caramel corn or caramel popcorn is a confection made of popcorn coated with a sugar or molasses based caramel candy shell that is normally less than 1mm thick. Typically a sugar solution or syrup is made and heated until it browns and becomes thick, producing a caramelized candy syrup. This hot candy is then mixed with popped popcorn, and allowed to cool. Sometimes, a candy thermometer is used, as making caramel is time-consuming and requires skill to make well without burning the sugar. The process creates a sweet flavored, crunchy snack food or treat. After coating with the candy syrup, some varieties are baked in an oven to crisp the mixture. Mixes sometimes contain nuts, such as peanuts, pecans, almonds, or cashews.
Puffed rice and popped rice are types of puffed grain made from rice commonly eaten in the traditional cuisines of Southeast Asia, East Asia, and South Asia. It has also been produced commercially in the West since 1904 and is popular in breakfast cereals and other snack foods.
Microwave popcorn is a convenience food consisting of unpopped popcorn in an enhanced, sealed paper bag intended to be heated in a microwave oven. In addition to the dried corn, the bags typically contain cooking oil with sufficient saturated fat to solidify at room temperature, one or more seasonings, and natural or artificial flavorings or both.
A popcorn maker is a machine used to pop popcorn. Since ancient times, popcorn has been a popular snack food, produced through the explosive expansion of kernels of heated corn (maize). Commercial large-scale popcorn machines were invented by Charles Cretors in the late 19th century. Many types of small-scale home methods for popping corn also exist.
The American Pop Corn Company is a family owned popcorn producer. Founded in 1914, it is the oldest popcorn company in the United States. Its only brand, Jolly Time, is sold globally and in every state in America. It employs 185 people, and its headquarters are in Sioux City, Iowa.
The Weaver Popcorn Company, based in Van Buren, Indiana, is one of the largest popcorn companies in the United States.
C. Cretors & Company is an American manufacturing company, specializing in popcorn machines and other concessions equipment. It was established in 1885 with the invention of the first large-scale commercial popcorn machine to pop corn in oil. C. Cretors & Co. is in Wood Dale, Illinois and is still owned by the Cretors family.
Puffcorn or corn puffs are puffed or extruded corn snacks made with corn meal, which can be baked or fried.
Wyandot Snacks is a privately held and family owned American contract manufacturer of snacks and other packaged foods, headquartered in Marion, Ohio, a part of the Columbus, Ohio Combined statistical area. primarily as a contract manufacturer for domestic and international branded snack businesses, but also for foodservice customers. The company's main product lines are extruded snacks, corn & tortilla chips, and ready to eat (RTE) popcorn. Wyandot's focuses on the creation of plant-based snack products made from ancient grains such as sorghum and quinoa, pulses such as chickpeas, and flaxseed, among others.
Tiny but Mighty Popcorn is an American brand of heirloom popcorn, introduced in 1981, when Iowa farmer Richard Kelty founded K&K Popcorn. Iowa farmers Gene and Lynn Mealhow later purchased the company in 1999, and subsequently renamed it.
Joe Brown's Carmel Corn is a caramel corn shop in Portland, Oregon's Lloyd District, in the United States. The business was established in 1932 by George Brown and his son Joe, originally operating as a single store in downtown. The Brown family expanded the company by opening two additional stores in the city and another in Seaside by the start of World War II. The war halted production and stores remained closed until 1960, when George's daughter Betty Brown and her husband Gordon Kalk opened a single store in the newly built Lloyd Center. Their son, Lee, owned Joe Brown's from c. 1980 to 1992. Subsequent owners have included siblings Ron Ertler and Diana Ray, Marc and Ratha Chouinard, and Cyndee Kurahara. The current owner, David Ferguson, acquired Joe Brown's in 2019.
↑ Linda Campbell Franklin, "Corn", in Andrew F. Smith (ed.), The Oxford Encyclopedia of Food and Drink in America. 2nd ed. Oxford: Oxford University Press, 2013 (pp. 551–558), p. 553.
↑ "The Archaeological Evidence". Maize: Origin, Domestication, and its Role in the Development of Culture. Cambridge University Press: 118–220. 2013. Retrieved 9 October 2024.
↑ National Academies of Sciences, Engineering, and Medicine; Health and Medicine Division; Food and Nutrition Board; Committee to Review the Dietary Reference Intakes for Sodium and Potassium (2019). Oria, Maria; Harrison, Meghan; Stallings, Virginia A. (eds.). Dietary Reference Intakes for Sodium and Potassium. The National Academies Collection: Reports funded by National Institutes of Health. Washington, DC: National Academies Press (US). ISBN978-0-309-48834-1. PMID30844154. Archived from the original on 9 May 2024. Retrieved 21 June 2024.
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