What is Amchoor powder?
It's made from dried green mangoes. It's very tangy and great to use when you want your spice blend or dish to have some tartness.
Amchoor powder is made from dried green mangoes with a honey-ish fragrance and fruity flavor. It's a hallmark of numerous curries -- I also found a fabulous little summary of it here: http://www.thespicehouse.com/spices/amchoor-powder .