Yellow Mustard Seeds Availability: In stock £1.09 Qty - + Add to Cart Wishlist Email to a Friend Share Description: Greenfields Yellow Mustard seeds can be used as a condiment in a variety of dishes. Mustard seeds can be used as is or can be roasted in a skillet. You can easily make your own mustard condiment by first macerating the seeds in vinegar or water. Yellow mustard seeds are one of the core spices in an Indian kitchen. They're also widely used in the pickling brine for gherkins.