Duck blood and vermicelli soup is a traditional delicacy made by cooking vermicelli, duck liver, blood, and intestines with dried tofu, dried shrimp, ginger, sesame oil, and caraway seeds. Although the dish is consumed in many Chinese regions, it is a specialty of Nanjing, famous throughout the world for its duck dishes, which is why it is sometimes referred to as the capital of duck.
According to a popular story, a poor man in Nanjing had killed a duck and used a bowl to hold its blood. While cleaning the duck, he accidentally dropped some vermicelli into the bowl and cooked the stew afterwards. When he tasted the stew, he found it quite flavorful, and a wealthy man heard about the newly created dish, thus employing the poor man as a cook for his family.