Legend has it that South Lake in Mengzi County, Yunnan Province, China once boasted a great many literary scholars who worked hard to become officials. One of them was a Xiucai (person who passed the imperial examination at the county level in the Ming (1368-1644) and Qing (1644-1911) dynasties) with the last name of Yang. Yang often went to read books at the pavilion located in the middle of the lake. Although his wife would always take him something to eat, Yang was always so deep into his studies that he often forgot to eat. By the time he would remember, the food had already become cold, and thus his health deteriorated. One day, much concerned about her husband, the wife killed a hen, and cooked it in a pottery pot along with some rice noodles. Then, she took the chicken, noodles and soup to her husband. After a while, she came back to clean up. However, what she saw was the food left untouched by her husband who was intently concentrating on his book. With a sigh, she decided to heat it for her husband to eat later, but to her surprise, the pot was still warm when she touched it. Uncovering the pot, she found a layer of chicken fat floating atop the soup, which, together with the pottery container, helped preserve the heat. From then on, she cooked in this way to keep the food warm, and her husband was always able to eat warm food. Later, many people cooked rice noodles in the wife's innovative way, and found them really delicious and fresh.