They resemble black olives, but they are whole walnuts, picked green in Armenia. They are then steeped in sugar syrup until they turn lush, sweet and tender; a little like marrons glacés, only moister. They are made by Anush , a company that specializes in excellent Armenian preserves. The walnuts are a perfect foil for pungent cheeses, pâté or roast duck or game. You can also nibble on them after dinner, add a dollup to ice cream or slice them to decorate your pumpkin pie. Drop a preserved walnut into a Manhattan cocktail instead of a maraschino cherry for a twist.