Roasted Heirloom Vegetables Bouquet Garni. The flavorings used refers to sprigs of herbs, usually rosemary parsley and thyme, and bay leaves tied together for roasting, steeping simmering with juices to flavor it. A bouquet can also contain a stalk of celery or a leek top; black peppercorns or other whole spices may be included as well. I just add the herbs and spices that will enhance the olive oil and go well with the chosen vegetables. I simply toss the cut vegetables in a bowl with the seasonings. Kosher salt, pepper and cider vinegar to intensify the taste. Roast on...