Omg, I stumbled upon this forum when I was looking for exactly the same thing. I have been craving for the chocolate sundae from Mcdonald's here too : (. Please let me know if you do find them (as I heard some local Mcdonald's might have them if they kept the old machine or something) .... we should group up and write them a letter to suggest them to bring it back ... They had it in Italy too. I just wish I was in HK < : (.