history
Immortalized by the 莼鲈之思 ('longing for water shield and perch') story in 《世说新语·识鉴》: during the Western Jin, official 张翰 (Zhang Han) was serving in Luoyang when an autumn wind reminded him of his hometown Wu's water shield soup and perch sashimi - he resigned on the spot and went home. The phrase became a literary byword for homesickness and for leaving office to return to rural life.
