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If I salt tomato, potato and pasta, their tastes change in completely different ways to me. Why is this? Had I put oregano on them, they'd all taste like oregano.

Update: The question is not "is it so?" but "why is it so?"

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up vote 2 down vote accepted

Two properties of salt that oregano doesn't have:

water solubility: you drop salt in water, you put it on chicken, you put it in tomato sauce. Most or all of it ends up dissolving, making it easier to mix.

osmosis: related to above. Sprinkle some salt on raw meat. Come back in 5 minutes and you'll see beads of liquid on the meat, almost like it was sweating. That's a combination of salt dissolving into the liquid on the surface of the meat, and osmosis pulling less salty water out of the cells of the meat to balance the salty water on the surface. In 10 minutes, some of that liquid will have disappeared. Part of this might be due to evaporation, but part of this is due to the liquid pulling salt into the cells, which changes the equilibrium and allows for the cells to draw liquid back in (principle behind brining meats).

Salt has a natural way of penetrating organic matter that oregano and many other seasonings don't. There are other mechanisms at play too--salty foods can make you salivate, which may make something feel "juicier" in your mouth. I'd highly recommend the Good Eats episode on salt as a start.

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Salt has a neat ability to bring out and enhance flavours in other foods. If the food tastes "salty", you're probably adding too much. If you use something like Kosher salt, you don't actually need to use very much to add the flavor.

Here's a decent article on it.

Alton Brown talks about it in many different episodes.

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Nitpick: Kosher salt isn't any stronger than table salt, it's just larger crystals. In many cases the crystals are hollow, which may mean that you need more than you normally would if you're measuring by volume and dissolving it, but less than you would if you're measuring by weight but using it for a crust or rub (i.e. something surface-area dependent). – Aaronut Feb 15 '11 at 22:18
Further nitpick: salts can use different anti-caking agents, and in different quantities, which have little or no taste and take up space. Two apparently same-sized grains of salt could have very different quantities of sodium chloride. – Eric Hu Dec 7 '11 at 11:16

Salt is completely water soluble, unlike only trace amount of what is in oregano. That being the case, it will completely saturate anything that is wet, therefore it can completely consume and pair with every bite, whereas oregano remains in chunks and can be distinctly tasted alone.

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Thanks! This is the closest to explaining why. – user4697 Feb 16 '11 at 10:18

This is because salt is a natural flavor enhancer, which basically brings out the flavor of whatever you are putting it in. Different salts also give different flavors, depending of the minerality in them.

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I realise that this happens, but was wondering why it is different from oregano. What do you mean by minerality? The small part that is not sodium chloride? – user4697 Feb 16 '11 at 10:23

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