How to use a rock of salt in the kitchen?

Innke

Hi, I have a rock of salt I bought at a salt mine and I thought I'd find how to use it on the internet, but I can't find anything. I guess it's possible to grate it (they were also selling salt graters which looked like a normal kitchen grater) and my friend says that his mom dissolves it in water, hut I wouldn't know how to use that.

Does any one of you have any experience with a salt rock?