The term "kosher salt" derives not from its being made in accordance with the guidelines for kosher foods as written in the Torah (nearly all salt is kosher, including ordinary table salt), but rather due to its use in making meats kosher, by helping to extract the blood from the meat. Rather than cubic crystals, kosher salt has a flat platelet shape. This is done in some salts by adding yellow prussiate of soda (sodium ferrocyanate). Because kosher salt grains are larger than regular table salt grains, when meats are coated in kosher salt the salt does not dissolve readily; the salt remains on the surface of the meat longer to draw fluids out of the meat.
at 3:19 PM on Jul. 22, 2010