Amchur (amchoor) powder is also referred to as "mango" powder. It is made from green dried, ground mangoes. The spice imparts a tart and slightly sour flavor to many Indian dishes including fish, meats, vegetables and curries.
Amchur can be purchased in any Indian market and some Asian grocery stores. Or, buy amchur online at Amazon.com Amchur (Dry Mango) Powder 3.5oz