Why are Sugar Plums a Christmas topic? Every year around the Christmas holidays the question comes up, "What is a sugar plum?" The simple response would be a small fruit confection rolled in sugar. While there are actual fruits known as sugar plums, most references to sugar plums are relating to various types of candied fruits.The basic concept of the sugar plum is preserving fruits with sugar allowing them to be enjoyed all year round, much like canning vegetables, or salting meats is used to preserve foods for year round consumption. Read more about Why are Sugar Plums a Christmas topic?