Hmm, we ate the Kitchen Sink during our trip in Dec 08. I asked the waitress why the menu said, "serves 4." I questioned if this would be enough ice cream for 6 of us. She laughed and said yes. She said you have to have at least 4 people to order it as your dessert on the
DDP. It counts as at least four desserts.
I remember on my previous trip in Oct 07 you could not order it but I think now you can if you have a party of 4 or more on the DDP. I saw some other menu items in various restaurants labeled like this i.e. serves 2, but I don't remember where.