Phil
Sulphur, Rotten Eggs, it tastes like the smell of. if that makes any sense

It also leaves a lingering after taste.
I like Chaat Masala, and Black Salt is one of the main ingredients.
There are loads of traditional recipes that call for it and when I'm
doing BIR curries I add it when I want an extra sourish flavour to the sauce.
cheers Chewy