Is Bordeaux a good pairing for mooncake? Collectors, particularly in Asia, have paid record-breaking sums for fine wines over the past couple of years. But market turmoil threatens to put a cork in soaring prices for all sorts of alternative investments. The next clue on the future of wine prices could come with an Asian festival in early September, according to Gary Boom, founder of wine merchant and investment tracker Bordeaux Index. The celebration is marked by the consumption of round pastry mooncakes filled with lotus-seed paste and a salted duck egg, as well as the exchange of generous gifts, including, in recent years, expensive bottles of Bordeaux.