What snack is Fuling cake? Where are the specialties?

I haven't eaten. Just listening to the name, I think it is a specialty of Guangdong generation. Because of poria cocos cream, I found it wrong on the internet. It turned out to be a specialty of Beijing. Fuling cake, also known as Fuling cake, is a traditional name for nourishing the Han nationality produced in Beijing. Because the skin is as thin as paper and the color is as white as snow, it is very similar to Fuling tablets in traditional Chinese medicine, so it is called "Fuling cake"

Fuling cake