According to legend, one of the Eight Immortals Zhang Guolao in the year of the drought, sympathetic to people's feelings, Shi Taoist law for the people to pray for rain, the people to thank him, in the ground between the support of a cauldron, the old and weak donkeys slaughtered, put into the pot cooking, did not expect to cook the meat is delicious after cooking, the hungry Zhang Guolao eaten after the addiction, leaving behind the "heavenly dragon, the donkey on the ground! "Famous saying. And the donkey is in the thousands of years, multiply, let people eat also can not eat, can be called the first human flavor.

The real sprouting of donkey roast in Hejian should be traced back to the Tang Taizong years, in the Tang King Li Shimin ascended to the throne before he passed through the Hejian, a scholar "killed donkeys and boiled broomcorn" to entertain Li Shimin, who ate it and then said: "Yummy, yummy, yummy". Visible at that time, Hezhang donkey cooking and processing technology has reached a very high level, a wobble to the Qing Dynasty, Emperor Qianlong down the Jiangnan must pass Hezhang, once missed the residence in the farmer's home for dinner, the farmer's home in order to allow the emperor to eat conveniently, the carefully cooked donkey meat to the layers of fluffy roasted, Qianlong ate praised the delicious flavor. Asked the farmer what this is, the farmer answered truthfully: the big barbecue with donkey meat, Qianlong is very happy, improvised a poem:

Hepan everywhere donkey Wang,

Crafty women rolling like paper.

Make a fire with donkey meat,

a wind to a fragrance.

And sent people to build a palace in the river often live, (River Qianlong Palace and handwritten monuments are recorded in history) to eat donkey roast delicious, after returning to the Palace also often miss the donkey roast, sent and the Squire came to the river to look for donkey roast of the family into the Palace, and the Squire is also a gourmet, the folk are also rumored to be eating a donkey and the Squire story, when the Mid-Autumn Festival and the Squire and a few ladies in the House to eat! Donkey meat barbecue to enjoy the moon, the moon was in the sky, and the Squire saw the crispy donkey meat barbecue inside the layers of very much, a layer thinner than the paper, eat in the mouth fluffy exception. When he picked up his wife's jade hand to play with it, he could not help but be inspired by the poem:

The jade man's fingernails are long,

Fire burns are very fragrant.

The two phases are all top quality,

To the moon through the gorgeous light.

The meaning of this poem is that women in the Qing Dynasty trimmed their fingernails very long and very thin, so thin that they could see the faint light of the moon through their fingernails, and the layer of the fire burned was the same as the thinness of the women's fingernails.

Then the Qing Xuantong three years (1911 AD), led by Dr. Sun Yat-sen, the success of the Xinhai Revolution, the Imperial Palace specializing in donkey roasted Hetao chef Xiaode Zhang escaped from the Forbidden City, returned to Hetao, opened a store operating donkey roasted to make a living, take the name of the store, "Wan Guan" means: endless good luck and wealth, cooking food to return to the Hetao! The name "Wan Guan" means "endless good luck and wealth". Wan Guan small store taste beautiful and thin profit, and soon formed a food culture, dozens of miles away from the people are walking to go, just to taste a few donkey meat barbecue. Wanguan's reputation grew.

Later Xiao De Zhang died and gave the store to his right-hand man Zhang Shicheng to operate, Zhang Shicheng after the old store will be passed on to the apprentice Zhang Zihua, generation after generation of Wannuan people, diligently will be run down the store, March 2006, Zhang Zihua grandson Mr. Zhang Haitao took over the operation of Wannuan donkey meat barbecue store, Zhang Haitao Wannuan donkey meat barbecue store based on the old store's ancestral technology, combined with the scientific dietary experience, original nineteen special production techniques, and the production of the store. Mr. Zhang Hai Tao has created nineteen special production techniques, from donkey slaughtering, donkey meat treatment, donkey meat cooking, flour selection, flour mixing skills, braising, stewing and soup preparation, all of which have been perfected. In order to achieve more scientific management and development, in 2008, Zhang Haitao set up Hetian Shengshi Catering Co. And re-registered a fashionable brand "Kung Fu Donkey" to enter the market of large and medium-sized cities.