Ejiao cake is a food made of Ejiao, black sesame, walnut kernel, crystal sugar and yellow wine.

It has the comprehensive health-care effects of nourishing blood, benefiting qi, beauty beauty, relaxing bowels and improving immunity, and is a tonic suitable for all ages with compound health-care value.

"Zhou Li Kao Gong Ji Gong Ren" records: "Deer glue blue and white, horse glue red and white, cow glue red, mouse glue black, fish glue bait, rhinoceros glue yellow."

Zheng Xuan's note: "It means cooking it with its skin or horns." As early as the Zhou Dynasty, rubber made of animal skins was carefully studied and classified, and cowhide was not the first choice of raw materials at that time, donkey skin and deerskin were more popular.

Ejiao was named after its earliest birth in Dong 'e. The earliest existing pharmacological monograph in China, Shennong Materia Medica Classic, listed Ejiao as "top grade", and Li Shizhen's Compendium of Materia Medica in Ming Dynasty recorded: "Ejiao Materia Medica Classic is the top grade. Hongjing said, "Out of East Afghanistan, it is called Ejiao". According to historical records, Li Shizhen was born in 15 18 and died in 1593.

There is also an ancient folk song circulating in Dong 'e, "Little black donkey, white belly, pink nose, pink eyes, pink hooves, eating grass on the lion's ear mountain, drinking water in langxi River, Yongji Bridge walking three times, Weijiachang rolling, slaughtering its skin in winter, and still need yin and yang water to make glue."

In the process of making glue, we can only burn Sang Mu and chop wood with a golden pot and silver shovel, and it will take 7749 days to make glue.