Who knows the origin of "Northeast Pancake"

Shandong pancakes, mostly coarse grains, are porous and can be thick (stacked) or thin, which is convenient to match with other foods and can be eaten on different occasions. People in Shandong eat pancakes, just like people in Xinjiang eat naan, people in Northeast China eat prickly heat, and Tibetans eat Ciba. "Shandong Shandong, pancakes roll green onions." Once upon a time, outsiders always commented on Shandong people like this, as if their heads were covered with sorghum flowers and their mouths always smelled of Zhangqiu green onions. Entering the 2 1 century, Shandong people have not changed their preference for pancakes. From Yimeng Mountain to Zihe River, from the foot of Mount Tai to the hometown of Confucius and Mencius, from Weishan Lake to the shore of the Yellow Sea, how many people grew up eating pancakes? How many people still like pancakes? This is an incalculable number. There is a famous saying that "where there are crowds, there is Hamlet". In other words, where there are Shandong people, there are pancakes. There is a thick stack of pancakes at home, and no matter how busy the farm work is, it will not delay the cooking time or starve because there is no time to cook. Distilled, baked, soaked, baked or eaten directly, pancakes can be eaten in any way. The history of pancakes It is difficult to find out when the modern method of making pancakes came into being, but the use of the word "pancake" can be traced back to a long time ago. According to legend, Meng Jiangnu cried in the Great Wall and brought pancakes. Legend has it that at the end of the Tang Dynasty, the Huang Chao Uprising Army was stationed in Mount Tai, and local people sent pancakes to each other. 1967, Dong Yang Lou Village, Shengzhuang Town, Tai 'an City discovered the "Separation Contract" in the Wanli period of the Ming Dynasty, including "a plate of cigarettes and 23 Jin of pancakes". Due to the appearance of Xunzi, we can be sure that modern pancake making methods existed at the latest in the Wanli period of the Ming Dynasty.