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The reason why it is called winter melon is that the melon matures in winter and has a layer of white frost on its body.
As for the origin of the name of winter melon, there are the following three theories:
The first one is recorded in "Ben Cao Yan Yi": "White winter melon is one or two buckets big, and it is harvested in the winter moon. Vegetable, fried with honey instead of fruit. It can keep out the cold, so winter melon is called winter melon."
The second type is said in Jia Sixie's "Qi Min Yao Shu" that it matures and produces melons after winter, so it is called winter melon.
The third type is that after the winter melon matures, it is covered with a layer of white frost, which looks like white snow falling on it in winter, so it is called winter melon.
In the sweltering summer, the frost on the surface of winter melon can give people a cool feeling, and the word "winter" also means coldness. Moreover, winter melon is indeed a good product to relieve the summer heat.