Why Use kosher salt? The Math vs. The Myth

Many home cooks ask why use kosher salt simply because they see professional chefs use it, but they end up ruining their food. The truth is that Kosher salt isn’t better; it’s just less salt per spoonful, and if you don’t know the math, your recipes will fail. So, don’t switch to kosher salt because it’s what the cool kids on TV use. Save yourself the “assault” on your taste buds.

🧂 TL;DR: The Kosher Salt Reality Check

Why the “Cheffy” Advice Fails

Most of the purported reasons for using Kosher salt don’t hold any salt! Professional chefs often claim they use Kosher salt for “control,” but for the home cook, it usually leads to the exact opposite. If you’re following a recipe that calls for a tablespoon of salt and you don’t know which salt the author used, you’re guessing, not cooking.

The Substitution Doesn’t Substitute

The biggest reason to be wary of the Kosher salt hype is the volume-to-weight ratio. Because Kosher salt has large, jagged crystals, it doesn’t pack together. A teaspoon of airy Kosher salt contains significantly less actual sodium than a teaspoon of dense table salt.

Salt Type	Volume (for 1 tsp Table Salt)	Weight (approx.)
Table Salt	1 Teaspoon	6 grams
Morton Kosher	1.5 Teaspoons	6 grams
Diamond Crystal	2 Teaspoons	6 grams

Salt Type	Volume (for 1 tsp Table Salt)	Weight (approx.)
Table Salt	1 Teaspoon	6 grams
Morton Kosher	1.5 Teaspoons	6 grams
Diamond Crystal	2 Teaspoons	6 grams

The “Purity” Argument: Anti-Caking and Iodine

One of the most common reasons cited by chefs for using Kosher salt is the lack of additives. While it’s true that many table salts contain anti-caking agents (like yellow prussiate of soda) and iodine, the idea that these “ruin” the flavor of your food is largely a culinary fairy tale.

• The Verdict: If you really want “pure” salt, you can buy non-iodized table salt for 50 cents. You don’t need to pay a premium for “Kosher” status just to avoid a trace mineral you can’t even taste.
• Clumping vs. Flow: Table salt is fine-grained, meaning it has more surface area to absorb moisture and clump together. Anti-caking agents are added so it actually pours. Because Kosher salt has larger crystals, it doesn’t need these additives to stay free-flowing.
• The Additive Reality: It is a common myth that all Kosher salt is additive-free. While industry leaders like Diamond Crystal and Morton do not add anti-caking agents to their coarse salt, other brands certainly do.
• The Nasty Iodine Taste: Chefs claim iodine makes food taste metallic. However, in a blind taste test, once the salt is dissolved into a soup or a sauce, the iodine concentration is so low (around 0.0045%) that it is chemically undetectable to the human palate.

The Iodine “Tang”: A Culinary Fairy Tale

• Concentration: Iodine in salt is ~0.0045%.
• The Taste Threshold: You’d have to oversalt the food to the point of being inedible before you could detect a metallic note.
• The Placebo: Most “metallic” tastes come from reactive cookware (cast iron/carbon steel), not the salt.
• The Verdict: If you really want “pure” salt, you can buy non-iodized table salt for pennies. Paying a 400% premium for Kosher salt just to avoid a trace mineral you can’t actually detect is a triumph of marketing over chemistry.

Why Is It Called Kosher Salt?

The name is a linguistic trick. The salt itself isn’t “holier” or “cleaner” than table salt; it is simply Koshering Salt. The larger crystals of kosher salt don’t actually have any special properties in cooking.

• The Industrial Tool: It was designed with large, jagged crystals specifically to stick to the surface of raw meat to draw out blood, the physical process of koshering.
• The Marketing Rebrand: Food companies realized that “Kosher” sounded like a premium status symbol, while “Koshering” sounded like a chore. By dropping the “-ing,” they turned a specific industrial tool into a must-have luxury staple.
• The Rabbi Myth: No, it isn’t “blessed.” While brands like Morton may have Rabbinical supervision for their packaging process, the salt itself is just sodium chloride—the same stuff in the 50-cent blue box.

Why the Chef Advice Often Fails: Chefs are as prone to dogmatic beliefs as much as anyone else. They often fail to understand the whether seas salt is truly different than regular salt, let alone kosher salt and expensive finishing salts.

The key to cutting through the confusion is to learn, at a basic scientific level, we we use salt in food at all!

Kosher Salt Myths

Because Kosher salt has become the “status symbol” of the modern kitchen, it has collected a mountain of folklore that ranges from the scientifically impossible to the purely superstitious. If we’re going to stop being “assaulted” by bad advice, we need to separate the marketing from the mineral.

Kosher Salt Comes From the Dead Sea

False! Kosher salt does not all come from the dead sea. It comes from the same places other salt comes from. It can be mined from anywhere salt is mined from. It does not have to be taken from evaporated salt near the sea.

It’s Harder to Oversalt with Kosher Salt

• The “Magical” Fallacy: Many YouTubers claim Kosher salt is “more forgiving.” In reality, it’s just sodium chloride. If you use too much, your food is salty; there is no chemical safety net.
• The Density Trap: People think it’s harder to oversalt because one teaspoon of Kosher salt contains less actual salt than a teaspoon of table salt. You aren’t safer, you’re just using a less efficient measurement.
• The Brand Variance: This myth is dangerous because Morton and Diamond Crystal have completely different densities. If you switch brands without checking the “math,” you will absolutely ruin your dinner.

One of the most important and ancient culinary salt uses is for food preservation. But what matters in our modern home kitchen are two others purposes. Most of the time, you are using salt as a seasoning. There is one other reason to use salt, as a flavoring! Confused?

Learn More: The Difference Between Seasonings and Flavorings

Kosher Salt Tastes Less Salty On Your Tongue

If you put a pinch of table salt on your tongue, it tastes like a chemical punch. If you do the same with Kosher salt, it feels milder. This sensory difference is what leads people to believe the salt is “more forgiving,” but it’s actually just a matter of surface area and timing.

• The “Salt Burst” Phenomenon: Because table salt is fine-grained, it dissolves instantly on contact with your saliva, hitting your taste buds all at once. Kosher salt’s large, jagged crystals take longer to dissolve. You aren’t getting “less” salt; you’re just getting it in a slow-release format.
• Tactile Feedback: When you use Kosher salt as a finishing salt (sprinkled on a cookie or a sliced steak), those crystals provide a physical crunch and a concentrated “burst” of flavor that table salt simply can’t replicate.
• The Sleeper Salt : This “milder” initial taste is exactly what causes home cooks to oversalt their pots, especially since Kosher salt takes longer to dissolve. They taste a grain, think “Oh, that’s not so salty,” and keep adding more. Kosher salt will pounce on you when you least expect it.

Ordinary Table Salt Dissolves More Quickly Than Kosher Salt

But, as the salt dissolves, that surface area comes into play. Since table salt presents MUCH more surface area to, say, a simmering soup, it will dissolve more quickly. With any salt, you need to wait an adequate amount of time after adding it before tasting so that the salt will have time to dissolve. If you don’t, you can easily oversalt.

If you are not used to kosher salt, you could taste too soon and therefore oversalt. The idea that there is some magical mechanism at work that will keep this from happening is silly. 

🤌 The “Infomercial” Pinch

The claim that table salt is “impossible to pinch” is the culinary equivalent of a late-night infomercial. It’s like the scene in Friends where Joey Tribbiani overacts his inability to open a simple carton of milk to sell a “better way.”

• The Performance: When experts “demonstrate” why table salt is inferior, they often hold their fingers loosely so the salt flows out like an hourglass. It’s a staged failure.
• The Reality: If you actually pinch your fingers together—as the word “pinch” implies—table salt stays put.
• The Visibility Trick: Television chefs love Kosher salt because the large crystals are easier for TV cameras to see. It’s a visual aid that has been rebranded as a technical necessity.
• The Verdict: While Kosher salt grains are larger and slightly more tactile, pretending you can’t distribute table salt with a simple “shearing” motion of your fingers is just theater.

No Advantage To Kosher Salt In Solution

Anytime you are cooking a dish with enough liquid to dissolve the salt, like a soup, stew, or pasta water, the type of salt makes zero detectable difference.

• The Sprinkling Myth: The idea that pinching and sprinkling Kosher salt into a simmering pot is superior to using a shaker or a spoon of table salt is purely made up. Once the salt hits the water, the “pinch” is irrelevant.
• Dissolving Physics: Some claim Kosher salt dissolves faster because it’s “less dense.” This is scientifically backward. Because table salt is finer, it presents more surface area and actually dissolves much faster.
• The Taste Delay: If you aren’t used to Kosher salt’s slower dissolve rate, you might taste your soup too soon, think it needs more, and end up oversalting.
• The Verdict: In any liquid solution, the only thing that matters is the final weight of the salt. If the salt is going to dissolve anyway, stick with the cheaper, faster-dissolving table salt.

If you’re wondering if you should step up even further to a finishing salt, see my guide on Fleur de Sel vs. Kosher Salt to see where the spending actually stops making sense

Harvesting Location of Kosher Salt

• Standard Origin: Despite the fancy labeling, most Kosher salt comes from the same mines as the 50-cent table salt box.
• The Sea Salt Pivot: Some brands label their product as “Sea Salt, Coarse Kosher.” While this salt might have trace minerals from evaporated seawater, those minerals vanish the moment the salt is dissolved in a soup or brine.
• The Marketing Gimmick: You may find brands harvested in “migratory bird reserves” or “exotic flats.” Unless you are using them as a finishing salt where the crunch and specific mineral “tang” matter, you are simply paying a premium for a backstory.

Baking With Kosher Salt

Don’t use kosher salt for baking. Baking recipes are developed using table salt and you need the salt to dissolve quickly. Kosher salt just won’t work for baking, especially if you don’t know the precise amount you need given the brand you use.

The Life Hack Delusion: Salt is Not a Personality

The more I look at the “Kosher salt or bust” movement, the more it looks like every other desperate “life hack” on the internet. It’s built on the fallacy that if you just buy the right gadget or use the “secret” ingredient, you’ll suddenly be a Michelin-starred chef.

• The Lollipops and Gingerbread Train: We’ve been sold a story that table salt is a primitive relic and Kosher salt is a sophisticated tool. In reality, you’re just paying a 400% markup for air and a holy sounding word on the box.
• The “Life-Changing” Lie: Your life will not change because you started pinching your salt from a wooden cellar instead of shaking it out of a blue cylinder. If you can’t season a dish correctly with table salt, switching to Kosher salt isn’t going to save you, it’s just going to make your mistakes more expensive.
• The “Joey Tribbiani” Test: I spent months “on the bandwagon” and eventually realized I was koshered out. I stood over a black surface, pinched some regular old table salt, and sprinkled it. Guess what? It was distributed perfectly. I didn’t need a “hack.” I just needed to use my fingers.
• The Final Verdict: If you like the “crunch” of a large crystal on a pretzel or the way kosher salt sticks to a steak you’re about to sear, buy it. But don’t pretend it’s a spiritual awakening. At the end of the day, it’s just salt.

It’s All Connected

• The Difference Between Taste and Flavor
• Why Salt Makes Sweets Sweeter