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Chefs are anything but nonchalant about sourcing ingredients. Missy Robbins, who cooks at Lilia in Brooklyn, has been using La Valle tomatoes for the past ten years; when it was time to choose a cooking olive oil for their restaurant, she tasted fifteen types before landing on Monini; and they bring in Tutto Calabria jarred chiles from Italy.
Even the salt, an ingredient often taken for granted, is carefully chosen: At Lilia, they use only Diamond Crystal kosher salt—and if Morton's comes in, Chef Robbins says, it throws everything off. (When Food52's Test Kitchen Manager worked in the kitchen at Franny's, he remembers using "the red box"—that's D.C., too).
It's not just chefs who have an expressed preference for a certain name in salt. When we asked our Twitter followers what brand of salt they use in cooking (as opposed to finishing or garnishing), they showed an allegiance to Morton's:
But is this brand loyalty among kosher salts based on family biases and traditions—it's what your dad used, it's what you're comfortable with—or is there a real, taste-able difference between these two major players?
Turns out that there are visible differences at the level of the individual salt crystals. As Jill Santopietro reported for Chowhound back in 2010, Diamond Crystal and Morton's have different shapes: Morton's is made by flattening salt granules into large thin flakes by pressing them through high-pressure rollers, whereas Diamond Crystal is formed by a patented method in which "upside-down pyramids [are] stacked one over the next to form a crystal."
This process, according Edward Schneider of the New York Times, who also wrote about D.C. versus Morton's in April of that year, is the patented Alberger method (yep—that's the same process used to make Flavacol stick so well to popcorn): It results in "handsome hollow pyramid-shaped grains. This hollow structure accounts for the salt’s lightness, and the thin walls of the 'pyramids' for its crushability."
In each pinch of Diamond Crystal, there's more space between the grains of salt (because the crystals don't sit as snug against each other)—which makes it, writes Santopietro, lighter and less salty than Morton's (and fine sea salt or table salt)—"and therefore more forgiving in the kitchen." You're less likely to over-salt if you use Diamond Crystal. Switch from Diamond Crystal to Morton's without making adjustments and your food might burn a hole through your tongue.
Schneider recounts his own experience:
Suddenly, I lost my knack for getting the salt spot-on: everything was oversalted. Everything. Pound cake tasted like something you might serve with pot roast, and pot roast tasted like the barrel-preserved meat served on HMS Bounty. For heaven’s sake, the spaghetti was too salty—I was overdosing the pasta water.
If you're wondering about converting between the different kinds of salts, Santopietro and Schneider have done that research for us:
- Schneider: 1 : 1.85, Morton's : D.C.
- Santopietro: 1 1/4 : 1 3/4, Morton's : D.C.
Santopietro's rule of thumb? "Think of Morton's and fine salt as roughly the same" and substitute it with nearly twice the amount of Diamond Crystal.
But recipe writers frequently neglect to identify the brand of kosher salt (shame on us!), even though it makes quite a difference. So what's a home cook to do? "Pretend they used Diamond salt," says Deb Perelman of Smitten Kitchen: You can always increase the amount of salt later.
Are you a Morton's or a Diamond Crystal sort of cook? And why? Tell us in the comments.