Yellow Mustard Powder Brassica alba finely ground yellow mustard seed. Milder and sweeter than brown mustard seed. An important spice the world over. In medieval Europe, mustard was known as ‘eye of newt.’ To make the ubiquitous condiment yellow mustard, it is combined with vinegar, turmeric, and other spices. It is also used, either whole or ground, in vinaigrettes, marinades, sauces, pickling, and with seafood and other animal foods. Organically grown. Protective amber glass jar. kosher and pareve