The salt of the sun. Unlike rock salt (which is mined from ancient underground deposits), sea salt is harvested by evaporating living ocean water in shallow pools. Depending on the geography (Mediterranean, Maldon, Brittany), it retains trace minerals like magnesium, calcium, and potassium, which give it a subtle "terroir" or complex flavour distinct from the metallic harshness of pure sodium chloride. In its flaky form, it is prized not just for taste, but for its jagged, pyramidal crystal structure.