What is Rock salt?

Salt crystals derived from the huge seams of impacted salt that have formed below dried-out, underground saline lakes. The crystals are quite large and hard so are best used in a salt mill.

Cooking salt is refined rock salt and table salt is finely ground and refined rock salt with magnesium carbonate added to make it free-running and damp-resistant. Salt-baking, cooking food - usually fish - in a crust of salt is a traditional way of cooking fish in some Mediterranean countries.