Sauté mushrooms and tomatoes in 3 tablespoons butter for 3 minutes. Combine with carrot, green pepper, onion, celery, garlic, olives, tomato paste, olive oil, wine, Worcestershire, cinnamon, cloves, allspice, mace, thyme, bay leaf, salt and pepper to make a marinade. Add duck pieces and marinate overnight or for at least 10 hours.
Simmer duck in marinade 1 1/2 to 2 hours or until tender.
Boil potatoes in salted water for approximately 15 minutes or until tender. Add to stew just before serving.Servings: 6 to 8