It's called kosher salt because it works for curing kosher meat

Salt is harvested from briny ocean water and underground deposits

Mostly sodium chloride, this compound is produced for human use by collecting seawater in shallow pans and allowing the Sun to evaporate the water until crystals remain. Underground rock salt is mined, crushed, and purified from deposits left behind by ancient seas that have dried-up.

Explaining why salt should be used to season food early in the cooking process

Experiments involving the same dishes, with salt added at the start of cooking versus at the end, have been shown to yield drastically different taste outcomes because salt takes time to diffuse into foods, particularly vegetables, whose cells are surrounded by cellular membranes and walls. Salting at the end will produce a concentrated surface coating, rather than even seasoning.

How five of the world's most expensive salt and spices are made

Part of the charm of certain spices and salts is their exotic origin, hailing from difficult-to-access locales or hewn via special processes. That also explains why they can be so expensive. Dive into the businesses of producing and marketing five of the world's most expensive food additives with this engaging video.

Although consuming saltwater can dehydrate and kill organisms, some fish survive by using specialized gills that leach excess salt from their bodies back into the surrounding water.

Manhattan's tiny wire allowing orthodox Jews to carry things on the Sabbath

An 18-mile wire known as an "eruv" encircles most of Manhattan, allowing observant Jews to carry things within its boundaries. This wire is one of many Sabbath workarounds rooted in the ancient rules for resting on the Sabbath day. Every week, a worker inspects the eruv line, and its maintenance costs $100K a year.

The Great Salt Lake's distinct dual coloration results from high-salinity organisms that only live in the northern portion and produce a purple protein.

Ketchup, 101

Ketchup is a tomato-based condiment mixed with vinegar, salt, and spices. The word likely originates from Southeast Asia, where it was used for a common fish brine sauce in the 18th century. For a brief period in the early 19th century, ketchup was viewed and marketed as a medicine. Henry John Heinz formulated a standard recipe in the late 1800s.

Understanding the biochemistry of ingredients and taste can improve flavor and texture

Keeping eggs at room temperature produces smoother batters when baking, and doing the same with tomatoes helps prevent a mealy, granular mouthfeel. Salting meat a day before gives more time for proteins to break down, improving flavor and tenderness, while cooking vegetables in well-salted water can lock in nutrients and color.

Why pickles became a thing

Pickles began in Mesopotamia around 2400 BCE as a way to preserve vegetables amid heat (and spoilage). They spread through Egypt, Greece, and Rome, where Julius Caesar reportedly fed pickles to his soldiers, and brining was treated as a culinary art. The technique is broadly useful, as salt and water can extend the shelf life and deepen flavor for almost anything.

How science came to understand umami

Before Dr. Kikunae Ikeda sat down in 1907 and pondered the taste of dashi, scientists typically agreed upon four types of taste: sweet, salty, bitter, and sour. He boiled 90 pounds of kelp into a resin that he then stripped of different compounds until he was left with a single ounce of brown crystals. Testing later revealed these crystals were glutamate, an amino acid and one of the protein's building blocks.

How the methods of catching fish for food affects their taste

Commercially caught fish are often killed through suffocation, allowing the causing the fish extreme stress and flooding their bodies with stress hormones and lactic acid. These chemicals cause the fish's flesh to become bitter where it was once rich and quickens the rotting process.

The rice in sushi was originally used as a way to preserve fish, but wasn't intended to be eaten.

How chefs suspend liquid in edible pearls resembling caviar to introduce a new texture to fluids

Through spherification, drops of a solution of sodium alginate and a flavored liquid are placed in a calcium lactate solution, which forms a chemical skin around them. This is because calcium replaces the sodium in the alginate chains, forming a gel around each drop's liquid interior.

Cheese is a less-well-known Hanukkah culinary tradition

It comes from a story of Judith, a widow whose hometown of Bethulia in Israel was seized by the Assyrian king Nebuchadnezzar. In some iterations, Judith brought the king's general, Holofernes, an array of salty snacks, including cheese, leading him to drink enough wine to pass out. Judith then beheaded Holofernes, inspiring the Israelites to attack and win the battle.

Why Christians eat fish on Fridays during Lent

The rule isn't actually to eat fish—it's to abstain from eating warm-blooded animals on Fridays, the day of the crucifixion. Fish filled the gap because it was cheap, plentiful, and theologically convenient. As it happens, the medieval Catholic calendar's proliferation of meatless days became one of the drivers of the global fishing industry.

What's the difference between an ocean, sea, and saltwater lake?

What are the seven seas, the five oceans, and why isn't the Dead Sea considered a sea? This overview provides definitions for each.

Monosodium glutamate is a sodium salt form of a naturally occurring amino acid

Monosodium glutamate myths originate from a 1968 letter to the New England Journal of Medicine, in which unpleasant symptoms after eating Chinese food were dubbed Chinese restaurant syndrome without medical data. Subsequent studies show this savory flavor enhancer—found in tomatoes, mushrooms, and other foods—is safe in moderation.

How to make a Hanukkah feast

You might think you know latkes and kugel, but this collection of Hanukkah-appropriate recipes from Food & Wine takes things to a whole new level. Shake things up at your next holiday table with cinnamon-cardamom sufganiyot, rugelach with a tahini glaze, or brisket with caramelized fennel.

The ocean gets its salt from runoff carrying fragments of eroded rock and from seawater dissolving salts and minerals from magma at seafloor spreading centers.

The food processing techniques developed for World War II, later repurposed for consumers

Research projects funded or sponsored by the military led to the development of active dry yeast to make bread easier to bake and an improved version of dehydrated cheese, which would be used in powdered cheese snacks. Freeze-drying, which had been used to ease the transport of blood plasma to battlefields, where it would be reconstituted with water, was later used on fruit for cereals.

Fish in polar waters contain proteins in their blood that act as antifreeze, and some manufacturers have used lab-grown versions of these proteins to help keep ice cream smooth.

The Borscht Belt was a haven for Jewish vacationers—and comedy fans

New York's Catskills region resorts were informally named after a dish popular with Ashkenazi Jews. The area offered affordable vacationing, as well as cutting-edge stand-up from future stars like Milton Berle, Mel Brooks, and Joan Rivers.

Pig organ transplants are apparently kosher—you just can’t eat them

Science writer Mary Roach speaks with journalist Terry Gross about her latest book, “Replaceable You: Adventures in Human Anatomy” and discusses topics including why pig organs have become of such interest and what religious leaders have told her about pig organs and compliance with Jewish dietary law.

How fermentation enables the pickling of food and the production of beer

This process occurs when microbes produce lactic acid, ethanol, or carbon dioxide after consuming sugars. The acid helps preserve vegetables in a brine solution during pickling and gives them a sour taste, while ethanol serves as the inebriant in alcoholic beverages. The acid and carbon dioxide give sourdough bread its taste and texture.

MSG was first isolated from seaweed in Japan in 1908

The compound monosodium glutamate has been identified in dairy, meats and vegetables, and provides an "umami"—Japanese for "tasty"—flavor to food. Studies in the late 1960s characterized MSG as harmful, but only when testing doses hundreds of times greater than what would be consumed in a typical diet.

The history of molecular gastronomy, from thickening yolks with alcohol to making art with food

Before understanding why they worked, humans used scientific principles, including designing solutions and analyzing outcomes, to develop preservation methods like curing meat and fermenting vegetables. By the 20th century, the application of industrialized food preparation to smaller kitchens set the stage for the subdiscipline of food science.

Norway is responsible for salmon sushi

Japanese sushi did not include salmon until the mid-1990s because Pacific salmon was known to contain parasites. Norway, meanwhile, had an abundance of Atlantic salmon, which was safe to eat raw. The country smelled an opportunity and launched Project Japan, which successfully convinced the country that Atlantic salmon was safe to include in its cuisine.

The fish in sushi is usually frozen to eliminate parasites

Most raw fish contain parasites, but sushi restaurants and fish markets use “super freezers” to make the food safe for consumption. The United States Food and Drug Administration warns that frozen raw seafood can still contain parasites, depending on the type of fish and the conditions of the “super freezer.”

There's no definitive reason why an ice cream sundae is spelled with an 'e' rather than a 'y.'

How hash functions encrypt stored passwords and can be enhanced with 'salt'

Hash functions convert text into unique, random sets of characters, a process that is computationally expensive and time-consuming to undo. Because hashed outputs for many common passwords are publicly listed, some sites use a salt—additional characters appended to a password—before hashing to produce an output that is not known. When entering a password, it is salted and hashed, then checked against the database for a matching hash before permitting login.

In the US, 'organic food' is defined by the USDA

Food products can only be classified as “organic” if they meet the standards defined by the US Department of Agriculture. For crops, that means avoiding prohibited substances and genetic engineering, among other requirements. For livestock, that includes a minimum number of grazing days.

The history of sufganiyot, or Hanukkah doughnuts

Mediterranean-focused food blogger Tori Avey shares her best recipe for fluffy, sugar-dusted sufganiyot and explains the history of the sweet that combines European and North African traditions.

The five most common chemicals found in modern food

Most modern processed foods rely on a number of preservatives to stay fresh from production to our plates. The most common include citric acid (preservative and flavor), sodium benzoate (preservative), xanthan gum (thickening and stabilizing), carrageenan (thickening), and red dyes 3 and 4 (for color).

Latkes, or fried potato pancakes, are eaten on Hanukkah to honor the miracle of the lasting oil

Deb Perelman, author of seminal food blog Smitten Kitchen, walks us through her foolproof recipe for classic potato pancakes. Among her tips: choose russet potatoes for a lighter latke, use a towel to wring the water out for extra crispiness, and add a sprinkle of baking powder for a little more lift.

Desalination involves costly, energy-intensive methods for producing freshwater

Thermal desalination heats saltwater to produce steam, and reverse osmosis forces saltwater through a membrane that only allows water through. In both cases, freshwater is collected and remineralized for consumption, while wastewater brine is often returned to the ocean, where it may harm marine organisms.

The research that led to sour

Scientists are trying to figure out if there are unique receptors that respond to the molecules that make up flavors we associate with calcium, blood, batteries, and other items that often escape dinner menus. Taste researcher Dr. Danielle Reed says the minimum evidence for a taste category typically involves identifying dedicated receptors and then removing them to show the taste vanishes.

Watch how dog kibble is manufactured by blending meats, grains, cereal crops, and corn kernels.

How cultured meat is made

In recent years, a number of companies have debuted meatless alternatives to traditional burgers, chicken, and more. Some are made from soy, while others use molecular formulations to recreate the flavor profile and texture of meat. Now, actual meat...

In osmotic power systems, the natural movement of water from regions of low to high salt concentration is used to generate electricity from pressurized water.

Explore the chemical compounds found in fireworks

Besides the various salts and metals used to produce fireworks colors, shells are also filled with gunpowder and oxidizers to help fuel and accelerate reactions. Chlorates help strengthen colors, while dextrin, a starch, helps hold mixtures together.

The benefits of sous vide: cooking food in bags immersed in water

Through this technique, food can be prepared to precise temperatures lower than those of open flames, without the risk of overcooking, with less oil, fat, and salt, and without requiring ongoing attention. By allowing for long cooking times, tougher cuts of meat can also be prepared at lower temperatures.

From 'Yankee cheddar' to American cheese

From "Yankee cheddar" to Kraft Singles, American cheese has a long history shaped by innovation and economics. Originally a cheddar export, it evolved into the processed slices we know today—thanks to a 1916 patent. And in the 1980s, it became “government cheese,” distributed to millions.

Hanukkah is one of 8 major Jewish holidays

This calendar, maintained by the Reform Judaism organization, not only shows when each holiday is to be celebrated in the current year, but also includes short histories and common rituals.

The phrase 'hot dog' likely evolved from the common name 'dachshund sausages,' a late-1800s slang term for sausages based on rumors that butchers were using substandard meat to make them.

The flavor of food can be enhanced by combining chemicals known to trigger umami taste receptors with nucleotides—building blocks of DNA and RNA—triggering an effect called umami synergy.

Michael Sveda discovered cyclamate by accident

When this lab researcher brought his hands to his lips to smoke his cigarette in 1937, he tasted something sweet, which he called cyclamate. It was quickly used in diet sodas, but it was banned from the US in 1969 after being linked to rodent bladder cancer in lab experiments.

Read a history of how oral rehydration solution was created

Experiments dating back to the 1940s eventually led to the creation and standardization of a mixture of sugar, salt, and clean water that is now widely used globally.

Ammonium may be the sixth basic taste

Researchers have proposed various candidates for the sixth official taste, including "fat." But research published in 2023 posits that ammonium should be considered the sixth taste since they found humans can apparently detect ammonium chloride, which the scientists describe as "bitter, salty, and a little sour." Detecting ammonia could be a survival mechanism to help detect when certain foods, including seafood, are no longer safe to eat. The work hinged on experiments with human cells exposed to ammonium chloride as well as rodent research.

'Omakase' roughly translates to 'I'll leave it up to you'

An omakase restaurant allows sushi chefs to craft custom-made rolls for patrons. The meals are often expensive, but there are good reasons for that: They include the freshest ingredients the restaurant has to offer and usually have limited spots. This short documentary focuses on Royal Sushi and Izakaya in Philadelphia.

Traditionally, a glut of unused eggs during Lent would be decorated at Easter

That's how the tradition started, at least in the more orthodox (or strict) branches of Christianity, which didn't eat meat, dairy, or eggs the whole period. By the end, there was more than could be eaten, so decorations ensued.