The south is the bean paste, fresh, ham, egg yolk and so on many kinds of fillings, among them with zhejiang jiaxing zongzi represented.

南方则有豆沙、鲜肉、火腿、蛋黄等多种馅料，其中以浙江嘉兴粽子为代表。

youdao

The cakes are filled with sweet bean paste or lotus seed, and at the very heart of each is a boiled egg yolk to symbolize the moon.

月饼里夹着甜豆沙或者莲籽，在馅的正中再放一个煮好了的蛋黄，象征着月亮。

youdao

It's totally up to you what filling to add, such as sweetened lotus seed paste, bean paste, egg yolk, you name it.

这个可以根据个人的喜好来决定，豆沙、莲蓉、蛋黄等等。

youdao

These small but dense cakes filled with lotus paste and a whole egg-yolk centre symbolise the full moon, and it is the accepted practice to share a cake with friends, family and colleagues.

BBC: Hong Kong��s enchanting homage to the moon