Old Tongin Gamjatang is a restaurant in Seoul that serves gamjatang (pork bone and potato stew) and single-serving bone hangover soup. It sits in an alley right next to Tongin Market in Seochon. The broth is made by boiling pork backbone and meat with cabbage, then adding soybean paste and red pepper powder. It is about a 10-minute walk from Gyeongbokgung Station Exit 2, and parties of two or more order gamjatang while one person orders bone hangover soup.