San Francisco is really behind on the inane most-expensive food item trend. Serendipity-3, a restaurant in New York, just unveiled to the public (well, mainly for the benefit of Guinness World Records) the world's most expensive dessert. The Frrrozen Haute Chocolate was declared the most expensive dessert in the world on Wednesday by Guinness World Records. The dessert is a frozen, slushy mix of cocoas from 14 countries, milk and 5 grams of 24-carat......