Are you thinking about the two species of plants? The various types of plum-shaped candy? Sugar coated coriander?
Apparently you're not thinking about the old art of coating plums with sugar.
'Twas the night before Christmas, when all through the house Not a creature was stirring, not even a mouse; The stockings were hung by the chimney with care, In hopes that St. Nicholas soon would be there; The children were nestled all snug in their beds; While visions of sugar-plums danced in their heads