You can make your own bouquet garni, wrapped and tied in a cheesecloth. For fresh herbs, use 3 sprigs parsley, 1 sprig thyme, and 1 bay leaf. For dry herbs, use 1 teaspoon parsley, 1 teaspoon thyme, and 1 bay leaf.
Substitute fish broth for the chicken broth if preferred.
Substitute 6 tablespoons cornstarch for the flour if desired.