Mustard is an ancient nourishing plant, dating back in written record to the time of the Roman Empire. Mustard seed on its own has a slight acidic, pungent flavor. Add mustard seeds to liquid and heat for seasoning and pickling. Use whole yellow mustard seeds with dill weed, bay leaves, cinnamon, cloves, allspice, coriander, mace, cardamom, and peppercorns to create a fascinating blend of pickling spice.