The poster put the question in Tai'an. It is obviously a famous food in Tai'an, but it can be found all over Shandong, and the one in Tai'an is the most authentic. I am from Tai'an, so when buying this snack, I have to buy it at the foot of the mountain. When climbing the mountain, the price will increase as the altitude increases. Let me give you a brief introduction:
Flat pancake rolled with green onions is a well-known Shandong local food and the representative food of our Shandong. The flatbread here actually refers to pancakes, not real flatbreads. The main difference between flatbread and pancakes lies in their different methods.
The former is made from white flour, while the latter is made from whole grains. When flatbread rolls with green onions became famous, white flour was still a rare thing, and whole grain pancakes were the staple food. Shandong pancakes and pancakes in Tianjin's so-called pancake fruit are not a new thing.
In short, the characteristics are crispy, welcome to Taishan to taste...