Rani 100% Pure Mustard Oil Although very similar in appearance, Indian mustard has a different flavor than its Mediterranean counterpart from which it originated. It was one the few affordable spices in Europe during the Middle Ages. In Indian cuisine, mustard seeds are toasted in oil before they are added to the dish. Mustard oil has many uses, from cooking to massage oils. Mustard has a strong pungent flavor, and unlike any other spice it has virtually no aroma.