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It comes down to the high sugar content of fruitcake and the not insignificant amount of booze included in many recipes.
罢丑别听聽of fruitcake include a sort of energy bar made by the Romans with barley, honey, wine, and dried fruit and a more recognized style of fruitcake in the early Middle Ages in Europe.
Fruitcakes are typically extremely sweet desserts, filled with fried, sugared, or otherwise preserved fruits and nuts. Their environment is one rendered nearly uninhabitable to most microbes that would move into a cake and make it unsafe to eat.
The often traditional inclusion and/or dousing in various spirits聽聽any germs survive.