Amchur powder, also known as mango powder, is a traditional Indian spice made from dried, unripe green mangoes, offering a tangy, sour, and fruity flavor without moisture. 
Here's a more detailed description:
Origin and Preparation:
Amchur powder is produced by drying unripe green mangoes, often sun-dried, and then finely grinding them into a pale, beige-colored powder. 
Flavor Profile:
It has a distinctive tangy, sour flavor with subtle sweet undertones, making it a versatile seasoning. 
Uses in Cuisine:
Souring Agent: Amchur is commonly used as a souring agent in Indian cuisine, particularly in vegetarian dishes, curries, chutneys, and soups. 
Marinades: It can also be used in marinades to tenderize meat and fish. 
Other Applications: Amchur can be added to various dishes like stews, dals, pakoras, and samosas to add a unique flavor. 
Substitute for Lemon Juice: It can be used as a substitute for lemon juice in certain recipes. 
Nutritional Benefits:
Amchur powder retains some of the nutritional benefits of mangoes, even when the fruit is out of season.