1. There is no lung at all in Couple Fei Pian, it’s just a homophonic name.

2. In the 1930s, there was a couple who ran a stall in Chengdu, Sichuan. The boy was named Guo Chaohua and the girl was named Zhang Tianzheng. Their cold beef lung slices were made with exquisite detail, with a golden-red color, spicy and delicious flavor. Unique, coupled with the tacit understanding and harmony between the couple, one makes and the other sells, the small business is booming, customers gather at the moment, and demand exceeds supply. There is the naughty student who often comes to taste the couple's beef slices. He writes the words "husband and wife's lung slices" on a piece of paper and sticks it secretly on the backs of the couple or on their small burdens. There are also people who eat and drink loudly, "husband and wife's lung slices." Husband and wife's lung slices?". One day, a merchant tasted the lung slices made by Mr. and Mrs. Guo and was so impressed that he presented a gold-lettered plaque with the four characters "Husband and wife's lung slices" written on it. From then on, the snack "Couple's Feather Pieces" became more famous. In order to adapt to the tastes and requirements of customers, the couple continued to improve the ingredients and production methods, and gradually used beef and haggis instead of beef lungs. Although there is no beef lung in the dish, people still like to call this dish the name Husband and wife lung slices, so it has been used to this day.