Saffron is a spice derived from the flower of crocus sativa, commonly known as the "saffron crocus". The vivid crimson stigma and styles, called threads, are collected and dried to be used mainly as a seasoning and coloring agent in food. Saffron has long been the world's most costly spice by weight. Hence it’s a high price. Fortunately, a little saffron goes a long way.