Duck tongue is a specialty snack in Wenzhou City, Zhejiang Province, belonging to Zhejiang cuisine, duck tongue is brined, air-dried to half-dry, chewing in the mouth, toughness, quite chewy. Wenzhou people call duck tongue for "duck earn", not duck tongue. In Wenzhou language tongue pronunciation and yawn pronunciation is similar, yawn Wenzhou business people, think "tongue" pronunciation is not auspicious, so the duck tongue renamed "duck earn".

"Duck earn" is contemporary, it is said that the rise of the time in the last century about the eighties. Wenzhou is a water city, with the Oujiang River, next to the sea. Even in the mountains, is also a developed water system, has achieved Xie Ling Yun, a Yongjia governor, opened the first of China's landscape poetry, Wenzhou will also be a duck's paradise. Wenzhou duck tongue shows that demand can be created, value can be created. Before the emergence of this dish, many people are disdainful of it, precisely shrewd Wenzhou people get it alone, after careful brining, become a delicacy.