Cut a 6" piece from the green part of a leek, then add 3 sprigs parsley, 3 sprigs thyme, 1 bay leaf, and 2-3 peppercorns, Fold bottom half of the leek up, then secure with kitchen string, leaving enough extra string to tie bouquet garni to the handle of the pot. (Or use a square of cheesecloth to wrap the ingredients, and tie it into a pouch with kitchen string.)