To prepare filling: Add vegetable stock, onions and leeks to a large stockpot on medium-high heat. Healthy sauté for 1-2 minutes then add mushrooms, garlic, chickpeas, mustard, tarragon, cinnamon, nutmeg, cloves, salt and pepper, to taste, stirring for an additional 2-3 minutes to infuse all flavors. With a slotted spoon, add mushroom mixture and return to oven for 10-15 minutes or until all is warmed, if not serving immediately. Serve with sauce, garnish with almond slivers and a few sprigs of tarragon. Super Yummy!!!