The sauce is finished with chopped pickled cucumbers, capers, parsley, chervil and tarragon.
en.wikipedia.org Frequently, crushed coriander seed is added, and variations may include the addition of other herbs such as chervil, chives, parsley, etc.
en.wikipedia.org Depending on the recipe, the "bouquet garni" may also include parsley, basil, burnet, chervil, rosemary, peppercorns, savory and tarragon.
en.wikipedia.org It is similar in appearance to chervil, the common cooking herb from the same genus.
en.wikipedia.org Tie the stalks of the chervil (or parsley) together and place in a large saucepan with the salt and stock.
www.stuff.co.nz