One of the five spices that make up yellow curry paste or powder, turmeric (also called yellow ginger and curcumin) is often used to add a deep yellow color to dishes. It is more than a coloring agent though since it imparts a distinct peppery flavor of its own. Unpeeled, it looks like a small ginger. Peeled, the flesh is a deep yellow (almost orange) in color. Fresh turmeric is prepared in much the same way as ginger. It is peeled then ground (traditionally, with a mortar and pestle) before it is added to food.
Recipes with tumeric: