How different salts change the texture of cured food

HostIt's funny how we usually think of salt as just a way to make food taste better, but when you look at a piece of ham or a slice of lox, the salt has done something much bigger. It has totally changed how the food feels when you bite into it. I have always wondered why some salt makes meat tough like a boot, while other times it makes it almost buttery. What's actually happening to the meat when we rub all that salt on it?

GuestMost people think salt is just there to dry things out, and that's a big part of it. When you put a lot of salt on a piece of raw fish or pork, it starts a kind of tug of war for the water. The salt sits on the outside of the meat and it's very thirsty. It starts to yank the water out of the tiny cells that make up the meat. This is why you see a pool of liquid at the bottom of the bowl when you cure something. But if it was only about drying the meat out, we would just end up with something that feels like wool or old leather. The magic part is that as the water leaves, the salt starts to crawl inside. Once it gets in there, it begins to mess with the shape of the meat itself.

HostWait, if the salt is pulling all the water out, shouldn't that make the meat much harder to chew? I mean, a grape is easy to bite, but a raisin is tough. It feels like we're just turning fresh meat into a raisin, which doesn't sound very buttery or snap-like.

GuestIt sounds that way, but think about what's inside the meat. It's full of long, thin strings of protein. Usually, these strings are all balled up or folded over each other in a very tight way. When the salt gets inside the meat, it acts like a pair of tiny hands that starts to untie those knots. The salt makes those strings relax and stretch out. Once they're stretched out, they start to bump into each other and get tangled up in a new way. They form a kind of web or a mesh. Instead of being a bunch of tight little balls, the meat becomes more like a dense gel. That's why a piece of cured salmon feels firm but also kind of smooth and bouncy instead of just being dry and crumbly.

HostSo the salt is basically rebuilding the meat from the inside out. But does it matter what kind of salt I use? I see all these huge tubs of kosher salt and then these tiny boxes of really fine table salt. Does the shape of the salt grain actually change how the meat ends up feeling?

GuestIt changes the speed and the evenness of the cure. Think about those big, flat flakes of kosher salt. Because they're big and flat, they don't all melt into the meat at once. They stay on the surface longer and pull the water out a bit more slowly. If you use very fine table salt, it's like a million tiny needles hitting the meat all at once. It can go too fast and make the outside of the meat very tough and salty before the middle even knows what's happening. People call that salt burn. The outside gets so tight and hard that the water in the middle can't get out anymore, and the salt can't get in. You end up with a piece of meat that's hard on the edges and kind of mushy and gray in the center.

HostI have definitely made that mistake before. It's like the outside of the meat turns into a wall. But what about that bright pink salt people use for things like bacon or salami? I always thought that was just for the color, so the meat looks pink instead of gray. Is that doing something to the texture too?

GuestIt really is. That pink stuff is usually regular salt mixed with a bit of something called nitrite. And you're right, it does keep the meat looking pink, but it also creates a very specific kind of snap. If you bite into a hot dog or a piece of high-end ham, there's a resistance there. It feels almost like a rubber band that breaks perfectly. Without that specific kind of salt, the meat strings don't tangle up in that same tight way. Instead of that bouncy snap, you would get something that feels more like cooked hamburger meat that has been pressed together. It would be crumbly. The pink salt helps lock those proteins into a very strong, tight grid that gives you that firm, clean bite.

HostSo if I used regular sea salt to make bacon, it would just feel like a salty pork chop instead of having that bacon-like chew?

GuestPretty much. It would be much softer and might even fall apart more easily. Sea salt is great for a lot of things because it has other minerals in it, like bits of magnesium or calcium that come from the ocean. Those minerals can actually make the meat feel a little bit more firm or even a bit crunchy on the very outside. But they don't have the same power to create that bouncy, cured feel that the pink salt does. And there's one more thing salt does that people forget. It helps the meat hold onto fat. When you cure a piece of meat with a lot of fat in it, like a salami, the salt helps the fat and the meat stay glued together. If you didn't have the right salt, when you cooked it, all the fat would just melt and run away, and you would be left with a dry, grainy mess.

HostIt's wild that such a simple thing is doing all of that work behind the scenes to keep the fat in place and the meat bouncy.

GuestIt even goes as far as changing how much water the meat can hold onto later when you cook it, because those tangled protein strings act like a trap that keeps the moisture from escaping the heat.

HostThe salt we sprinkle on a steak at the table is just there for a quick kick of flavor, but when we let it sit, those tiny crystals really do act like engineers that rebuild our food from the inside out.