But there is a line where the children in the story are "were nestled all snug in their beds/ While visions of sugar plums dance in their heads." I have always wondered what a sugar plum was, but my parents didn't know what it was. They said what everyone thinks, that it is a sugar coated plum... yuck! Well, guess what? They were wrong!
Jawbreakers are sugar plums.
Jellybeans are sugar plums.
M&Ms are sugar plums.
And so on, the plum "shape" is purely coincidental or to make it easier in the "panning" process. No, MilyWays and 3Muskateers are not sugar plums, despite the different layers. The "seed" must go through the "panning" process and candy bars don't.
So now you know what a sugar plum is and when someone asks, you can tell them what a sugar plum actually is.
Wait! This means that the Sugar Plum Fairies from The Nutcracker are candy fairies! Who knew?!