The Golden Opulence is a sundae that is served by special order at the New York City restaurant Serendipity 3. In 2007 it was listed in Guinness World Records as the most expensive sundae in the world at a price of $1,000.
The restaurant has stated that they sell approximately one per month. A notice 48 hours in advance is needed when requesting the Sundae, since ingredients must be flown in from different parts of the world.
(thanks Miss Rare)