Mustard seeds are small round seeds derived from the mustard plant. They come in different varieties such as yellow, brown, and black, each with a unique flavor profile. Rich in protein, fiber, and essential minerals like calcium and magnesium, mustard seeds also contain beneficial compounds like antioxidants and omega-3 fatty acids. Widely used in cooking and pickling for their pungent flavor and aroma, mustard seeds are a staple in Indian, Mediterranean, and Middle Eastern cuisines, adding depth to dishes ranging from curries to marinades.