Best Chocolate in the World - Amore in Bellevue, Washington.
Marina Abrabmovic's Chocolate Lips (made for a dinner party from a mold of her mouth to celebrate the end of her MOMA exhibition in June 2010).
Incidentally the above is not unlike Claes Oldenburg's Wedding Souvenir from 1966 - though not made of chocolate but of plaster. Oldenburg made these for LACMA curator Jim Elliott’s 1966 wedding. I learned from reading Ed Ruscha's Los Angeles this summer that when some guests did not take theirs home [what?!?], Dennis Hopper gathered up enough to make his own personal cake from the remaining pieces.
You can't leave out Janine Antoni's Gnaw from 1992:
Then listen to Tay Zonday's Chocolate Rain.