Kakuni

buta no kakuni, buta kakuni, 角煮

Kakuni is a Japanese braised pork belly dish which literally means "square simmered". It is made by braising fatty pieces of pork in soy sauce, mirin, and brown sugar. The Okinawan regional variation is called rafute. Kakuni is a popular regional cuisine (meibutsu) of Kyushu, particularly Nagasaki. This particular dish most likely originated from the famous Chinese dish Dongpo Pork, making it a form of Japanese Chinese cuisine, although the gravy is less heavy than the original dish. During the Ming Dynasty and Song Dynasty, the main Sino-Japanese trading route existed between Hangzhou and Kyūshū. Many Chinese lived in major port cities in Kyushu, such as Nagasaki; likewise many Japanese lived in Hangzhou. Therefore, pork was popularized in major Kyushu cities.[citation needed]

Source: Wikipedia