Kalpasi, alternatively known as Dagad phool or black stone flower is a kind of lichen. This blackish purple mystery flower is often blended with other spices to make delectable masalas. It is a common spice used in Chettinad cuisine such as Chettinad masala and some Maharastian dishes. Though kalpasi does not have any taste of its own, it adds a distinctive flavour to whatever dish it is added to. This spice is believed to be a part of traditional goda masala and garam masala.