Pickling spice is a blend of spices used to flavor pickled vegetables and other foods. It typically includes DILL, which is a herb with a strong, distinctive flavor. Other common ingredients in pickling spice include mustard seed, coriander, bay leaves, allspice, ginger, cloves, and peppercorns. The combination of these spices creates a unique flavor that can be used to enhance the taste of pickled foods.