This is very typical and traditional Chinese food. It is based on a Chinese desert, which name is "葱油饼”（literally in English is green-onion pancake). In different regions of China, people add various food and call it differently. You can add lettuce, egg, ham, bacon...anything you want.
These pictures were taken at 6 am when I was traveling in Beijing this summer (I am from Shanghai). And this "Beijing-Style-Green-Onion pancake" was made by a old female resident. She put lettuce and egg in it. As the picture shows, She cooked the pancake on her tricycle, which carried everything for cooking. Every morning between 6 to 8, she came out with the tricycle, cooking and selling her pancake. Guess how much each pancake is? The one in the picture was only 40 cents and it is delicious！
