A bouquet garni is an herb seasoning for slow-cooked dishes like soups and stews. While there is no set combination of herbs in a bouquet garni, the most frequently used ingredients are parsley, thyme, and bay leaf. If you’ve got celery in the dish, you might add a few celery leaves to the bouquet. And if you’ve got a leek in the dish, then it’s neat, efficient, and flavorful to use a washed leek green as the wrapper for the herbs: tuck the herbs into the green and tie them up with twine. If your bouquet also includes dried spices, such as peppercorns and coriander seeds, it’s best to make a sachet by placing the ingredients in a double thickness of cheesecloth, folding the cheesecloth into a packet or sachet to enclose all the little bits of herbs and spices, and securing the sachet with kitchen twine. If you’re a gadget collector, you might want to purchase a mesh ball on a long thin chain — it looks like an oversized tea infuser — to replace the leek or cheesecloth.