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Citat:
We know that salt penetrates food slowly when cold. (In a previous experiment, we found that it took 24 hours for salt to diffuse into the center of a refrigerated raw turkey.) While the process is faster during cooking—for example, our science editor noted that the rate of diffusion of salt into meat will double with every 10-degree increase up to the boiling point—it’s still not instantaneous. Furthermore, salt penetrates vegetables even more slowly than it does meat (this is because the salt must cross two rigid walls surrounding every plant cell, while the cells in meat contain only one thin wall). Adding salt at the beginning of cooking gives it time to migrate into the pieces of food, seasoning them throughout. Meanwhile, if you add salt only at the end, it provides a more concentrated, superficial coating that immediately hits your tongue.
