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 .

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.