Geo wrote:As nr706 notes, once salt is in solution, all Na+ and Cl- ions are the same. But Cook's *did* go on to note a preference when salting, e.g., grilled steak: Maldon. But, as they remarked, that preference was at least in part due to the quite evident texture differences among Maldon and all the other candidates.
This is only partly correct. In principle, of course, salt is sodium chloride
predominantly. However, depending on the source and how the salt is produced, the traces of other minerals provide unique and very discernible flavour profiles. In any strongly flavoured food the salt's character besides its saltiness will be lost. However, for seasoning or finishing simply prepared foods, the taste of the salt (and also texture as noted) come through. That is why in my salt mill I sometimes add dried tangerine peel, or some cumin seeds. I avoid 'salt' that contains anti-caking agents and so I simply use kosher salt as an all purpose salt. For some purposes sea salt is nice. I have balked at the prices of fancily packaged seemingly exotic salts.
In India, where rock salt is readily available at not ridiculous prices, it is used to season chaats, relishes, sprinkled over cut tomatoes and cucumber, used in sweet-salty limeade. Not for texture – more for the specific taste. In Bengal, 'beet noon' or beet salt (presumably due to the colour) – is a seasoning that cannot be subsituted, in many dishes
(see this webpage)
Rock salt or Beet salt
click for larger img
This has a tangy bite with a hint of a sulphurous aroma. Salt, but not mere NaCl.
see also:
http://www.mii.org/Minerals/photosalt.html