Brown Mustard Seed Brassica nigra 2mm round seed with sharp, pungent flavor. Mustard, once called 'eye of newt' is an important spice in many cuisines. Brown mustard seed is hotter than yellow mustard and is used sparingly either whole or ground, in vinaigrette, marinades, sauces, soup, stew, pickling, and with seafood, poultry, and meats. It can be ground and combined with vinegar and turmeric to make mustard at home. Organically grown. Protective amber glass jar, kosher and pareve.