Haldi powder, also known as turmeric powder, has a warm, bitter flavor and an earthy, mustard-like aroma. It's a bright yellow spice that comes from the dried rhizome of the Curcuma longa plant, which is related to ginger. Turmeric powder is a key ingredient in curry powder and is used as a yellow food dye in many Indian dishes, including curries, pickles, and rice.