For Loaf: Preheat oven to 350 Saute celery, onions, carrots & garlic in olive oil til softened, set aside and cool slightly. Add the spices, mustard & Worcestershire. Crumble crackers into a large bowl, moisten with chicken stock, add eggs, parsley, and then the meat mixture. Fold all together; try not to handle too much. Form into a loaf in a 9 x 13 baking dish. For Topping: mix together ketchup/chili sauce, brown sugar, apple cider vinegar & maple syrup and heat in small saucepan. Spread 1/3 topping mixture over the top, bake loaf for 45 minutes. Remove and spread another 1/3 topping mixture over the top, bake for another 15-20 minutes (register 160 on thermometer). Remove and let sit for 10 minutes, serve with remaining 1/3 of sauce.