*Uses Google Translate to look up "Marrons Glacés"
*Translation is French for water chestnut
What does this doujin have to do with water chestnuts?
They are actually candied chestnuts, They tend to be a holiday confection on their own, but they're also an ingredient for mont blanc and other confections.
As the title of this doujin, I would imagine the idea is to convey "warm, sweet and comforting". Which I think is a good description.