You can buy mixed pickling spices at any supermarket, but you may prefer to mix up your own to suit your tasts. Here's an example:

Ingredients

　　one 4-inch cinnamon stick, broken up

　　6 bay leaves, torn into small pieces

　　6 small dried chile peppers, cut into small pieces

　　1 tablespoon black peppercorns

　　1 tablespoon yellow mustard seeds

　　1 teaspoon fennel seeds

　　2 teaspoons whole allspice

　　1 teaspoon whole cloves

　　2 teaspoons whole coriander

　　1/2 teaspoon blade (unground) mace or small pieces of nutmeg

　　1/2 teaspoon fenugreek

　　1 tablespoon dill seeds

　　The Joy of PicklingHarvard Common Press