Yellow Mustard Seeds, commonly known as Rai Powder, originate from the Himalayan Mountain foothills and have been mentioned in ancient Sanskrit writings dating back 5000 years as well as the New Testament for their benefits.Rai Powder is commonly used in Indian curries to add a distinctly sour and nutty flavor. It is an enticing blend of fresh aroma and natural color. Rai powder is extensively used in pickles as it lends a slightly tangy taste.