Gather freshly washed herbs and bay leaf in a bundle. Wrap the butcher's twine around the bundle several times then knot it; set aside.
Melt the butter (2 tablespoons) in a large pot and sauté onions (1 cup), carrots (2 cups), and celery (1 1/2 cups) until onion is translucent and carrots are softening, about 10 minutes. (Remember they will finish cooking in the broth). Add garlic (4 cloves) and continue to sauté until fragrant, about 1 minute.
Stir in the dried poultry seasoning (1 1/2 teaspoons), Cajun seasoning (1/2 teaspoon), salt (3/4 teaspoon), and cook, stirring constantly, for 2 minutes.
Whisk together Better Than Bouillon (1 heaping tablespoon) and boiling water (1/2 cup) in a small mixing bowl.
Gradually stir in low-sodium chicken broth (8 cups) and the dissolved Better Than Bouillon and water. Add bouquet garni. Bring to a boil over high heat. Immediately reduce heat and gently simmer, uncovered, for 40 minutes.
Add the Israeli couscous (3/4 cup) and bring to a boil. Reduce heat and simmer until the couscous is tender, about 6-8 minutes.
Stir in the turkey (4 cups), spinach (4 cups), and lemon juice (1 tablespoon) and continue to cook until the turkey is heated through and the spinach is wilted. Adjust seasoning if needed. Ladle into individual bowls and garnish with parsley (2 tablespoons). Serve immediately.