Saffron is known as Zafaran or Kesar. The thread like part of Zafraan flower is used for many health and medicinal purposes. Zafraan is one of the most expensive spices in the world as maximum of its processing work is done through hand. Saffron is extremely valuable spice because of its distinct flavor, health and medicinal properties.Saffron threads are the whole stigma from the saffron crocus. You cannot just add saffron threads to your dish. The threads need heat to activate their flavor and color.