Shandong miscellaneous grains pancake with sauce in the middle, crisp. Where is the authentic city of origin in Shandong?

In fact, the original name of that thing is; Pancake fruit. Originated in Tianjin, inherited and developed in Shandong. Because Shandong used to be a big pancake province, Shandong produced green onions, and pancake fruit was carried forward in Shandong. General pancake fruit is full of fritters, and now you can still see fritters pancake fruit on the roadside. But then slowly, other things can be sandwiched in the pancake fruit, such as pancakes rolled with green onions, such as those golden crispy cakes, hehe.