Turmeric: Turmeric (binomial name: Circuma longa), once processed from the rhizomes, is a deep orangish yellow powder. It is used mainly to impart color or in other words dye foods. When it comes to flavor, the spice tastes slightly bitter and peppery with undertones of earthy flavor. Though used mainly as a powder, turmeric is also used fresh in its rhizome form in certain regions of the world.