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Butter: the story on HearLore | HearLore
Butter
The word butter derives from the Greek bouturon, meaning cow-cheese, a linguistic clue that reveals how ancient cultures viewed this substance not as a spread but as a form of dairy cheese. For the ancient Greeks and Romans, butter was considered food fit only for barbarians, a substance so foreign to their Mediterranean diet that they used it primarily as medicine or an unguent for the skin. Pliny the Elder, writing in his Natural History, described butter as the most delicate of foods among barbarous nations, while the physician Galen later codified its use strictly as a medicinal agent. A play by the Greek comic poet Anaxandrides even referred to the Thracians as boutyrophagoi, or butter-eaters, marking them as outsiders who consumed this strange, fatty substance. This cultural rejection persisted for centuries, as butter spoiled quickly in the warm Mediterranean climate, unlike cheese which could be preserved for long periods. It was not until the cooler climates of northern Europe allowed for longer storage that butter began to transition from a medicinal curiosity to a staple food source.
The Churning Process
The transformation of cream into butter relies on a delicate physical battle between fat globules and the membranes that surround them. Unhomogenized milk contains microscopic globules of butterfat, each wrapped in a protective shell of phospholipids and proteins that prevents the fat from pooling together. The production of butter begins when cream is agitated, a process that damages these membranes and allows the milk fats to conjoin into a single mass. This agitation separates the fat from the watery portion of the cream, known as buttermilk, which is then drained away. The remaining butter grains are pressed and kneaded together, a step historically performed on wooden boards called scotch hands to consolidate the butter into a solid mass. Modern commercial butter contains approximately 80% butterfat and 15% water, while traditional methods may yield products with as little as 65% fat and 30% water. The consistency of the final product depends on the ratio of free butterfat, butterfat crystals, and undamaged fat globules, with higher crystal content resulting in a harder texture.
The Bog Butter Mystery
In the cool, airless environment of peat bogs across northern Europe, particularly in Ireland, farmers once buried firkins of butter for years, creating a substance known as bog butter. This practice, most common between the 11th and 14th centuries, involved packing butter into barrels and interring them in the acidic, antiseptic soil of the bog to preserve them. Archaeological finds from the National Museum of Ireland , Archaeology reveal these buried treasures as grayish, cheese-like substances that remain partially hardened and free from putrefaction despite centuries of burial. The bog butter developed a strong, unique flavor as it aged, surviving in an environment that would have destroyed the product under normal conditions. This method of preservation was so effective that it persisted until the 19th century, when the practice finally ended. The existence of bog butter highlights the ingenuity of pre-modern societies in managing food scarcity, turning the earth itself into a refrigerator that could keep dairy products edible for generations.
Common questions
What is the origin of the word butter and how did ancient cultures view it?
The word butter derives from the Greek bouturon, meaning cow-cheese, and ancient Greeks and Romans considered it food fit only for barbarians. They used it primarily as medicine or an unguent for the skin rather than as a staple food. Pliny the Elder described it as the most delicate of foods among barbarous nations while Galen codified its use strictly as a medicinal agent.
How is butter made from cream and what are the physical processes involved?
The production of butter begins when cream is agitated to damage the protective membranes of fat globules, allowing the milk fats to conjoin into a single mass. This agitation separates the fat from the watery portion known as buttermilk, which is then drained away. The remaining butter grains are pressed and kneaded together to consolidate the butter into a solid mass.
What is bog butter and how was it preserved in northern Europe?
Bog butter is a substance created by farmers burying firkins of butter in the acidic, antiseptic soil of peat bogs across northern Europe. This practice was most common between the 11th and 14th centuries and involved packing butter into barrels to preserve them for years. Archaeological finds from the National Museum of Ireland reveal these buried treasures as grayish, cheese-like substances that remain partially hardened and free from putrefaction.
When did mechanization of butter production begin and who invented the cream separator?
The mechanization of butter production began in the late 1870s with the introduction of the centrifugal cream separator by Swedish engineer Carl Gustaf Patrik de Laval. The first butter factories appeared in the United States in the early 1860s, and by 1920, Otto Hunziker had published The Butter Industry to standardize practices internationally. In 1907, Swift and Company revolutionized distribution by packaging butter into small, rectangular sticks wrapped in waxed or foiled paper.
What is the difference between cultured butter and sweet cream butter?
Cultured butter is fermented to develop a tangy flavor using bacteria that convert milk sugars into lactic acid, while sweet cream butter is made from fresh cream without fermentation. This process can take up to 72 hours, whereas sweet cream butter can be produced in just six hours. The United States and the United Kingdom dominate the market for sweet cream butter, while France and other European nations favor the cultured variety.
How much butter was produced worldwide in 2022 and what is its composition?
World production of butter made from cow milk reached six million tonnes in 2022, with the United States leading the market with 13% of the total. Butter is a semi-solid emulsion at room temperature composed of approximately 81% butterfat and is used as a spread, melted as a condiment, or employed as a fat in baking and sauce-making. The density of butter varies, and its natural color can range from deep yellow to nearly white depending on the animal's genetics and diet.
The mechanization of butter production began in the late 1870s with the introduction of the centrifugal cream separator, a device marketed most successfully by Swedish engineer Carl Gustaf Patrik de Laval. This invention sped up the process of separating cream from milk, allowing for the rapid production of butter on a scale previously impossible. The first butter factories appeared in the United States in the early 1860s, following the establishment of cheese factories a decade earlier, and by 1920, Otto Hunziker had published The Butter Industry to standardize practices internationally. The American Dairy Science Association worked to eliminate defects such as tallowiness and mottles, while introducing standardized measurements for acidity and salt content. In 1907, Swift and Company revolutionized distribution by packaging butter into small, rectangular sticks wrapped in waxed or foiled paper, a format that remains dominant today. This shift from hand-pressed pucks to mass-produced sticks allowed butter to be sold in four-ounce units, creating two distinct shapes known as the Elgin or eastern-pack and the western-pack, which differ in dimensions and are still used in different regions of the United States.
The Cultured Divide
A significant divide exists between cultured butter, which is fermented to develop a tangy flavor, and sweet cream butter, which is made from fresh cream without fermentation. Cultured butter, preferred throughout continental Europe, involves bacteria converting milk sugars into lactic acid, producing aroma compounds like diacetyl that create a fuller, more buttery taste. This process can take up to 72 hours, whereas sweet cream butter, which became common in the 19th century due to refrigeration and mechanical separators, can be produced in just six hours. The United States and the United Kingdom dominate the market for sweet cream butter, while France and other European nations favor the cultured variety. French butter often contains a minimum of 82% butterfat compared to the 80% minimum in the U.S., and is frequently grass-fed, contributing to the reputation of French pastry as richer and flakier. Chef Jansen Chan of the International Culinary Center in Manhattan notes that the combination of culturing, higher fat content, and grass-fed dairy explains the superior quality of European butter. Despite these differences, some American dairies, particularly Amish communities, produce cultured butter, and the term European-style is sometimes used to label it in the U.S. market.
The Margarine War
Butter consumption in most western nations declined during the 20th century as margarine rose in popularity, driven by its lower cost and a perception of better health. In the United States, margarine consumption overtook butter during the 1950s, and it remains the case today that more margarine than butter is eaten in both the U.S. and the European Union. This shift was fueled by the development of synthetic fats that could be produced without using materials from animals or plants. Companies like Savor are now exploring the future of food by synthesizing fat from carbon dioxide, methane, and water taken from the air, creating butter without any animal or farmland involvement. The decline of butter was also influenced by health concerns, with a 2015 study suggesting that hypercholesterolemic people should keep their consumption to a minimum. However, a 2016 meta-analysis found relatively small or insignificant associations between moderate butter intake and mortality or cardiovascular disease, suggesting that major dietary guidelines do not need to emphasize increasing or decreasing butter consumption. The battle between butter and margarine continues to shape the global dairy industry, with new technologies potentially rendering the distinction between animal and synthetic fats obsolete.
The Science of Flavor
The flavor and texture of butter are determined by complex chemical interactions, including the presence of diacetyl, which boosts the buttery taste, and the addition of lactic acid or diacetyl to simulate the flavor of cultured butter without full fermentation. Commercial butter often contains food colorings like annatto or carotene to achieve a pale yellow to deep yellow hue, though the natural color depends on the source animal's feed and genetics. In the United States, manufacturers can add annatto without declaring it on the label, as it is considered a flavorless and natural coloring agent, unlike other foods that must disclose coloring agents. The smoke point of butterfat is around 200 degrees Celsius, but the milk solids within butter brown and burn above 150 degrees Celsius, making clarified butter or ghee better suited for frying. Ghee is clarified butter heated to around 120 degrees Celsius after the water evaporates, turning the milk solids brown and producing antioxidants that help protect it from rancidity. This process allows ghee to be kept for six to eight months under normal conditions, making it a stable cooking fat for high-heat applications.
The Global Spread
In 2022, world production of butter made from cow milk reached six million tonnes, with the United States leading the market with 13% of the total. Butter is a semi-solid emulsion at room temperature, composed of approximately 81% butterfat, and is used as a spread, melted as a condiment, or employed as a fat in baking and sauce-making. The density of butter varies, and its natural color can range from deep yellow to nearly white depending on the animal's genetics and diet. Salt has been added to butter since antiquity to help preserve it, particularly during transport, though modern refrigeration has reduced the need for salt as a preservative. Today, salt is added primarily for taste, and food coloring is used to enhance the visual appeal of the product. Butter remains a firm solid when refrigerated but softens to a spreadable consistency at room temperature, melting into a thin liquid at higher temperatures. The storage of butter requires careful handling to prevent rancidity, which is hastened by exposure to light or air, and wrapped butter can have a shelf life of several months at refrigerator temperatures.