Homologous relationship. Yongxin blood duck and Lianhua blood duck belong to the same family, and the cooking method of blood duck is the same. The only difference is that the lotus blood duck is small and troublesome to eat, but it tastes better. Blood duck is a characteristic traditional dish in Yongzhou City, Hunan Province, which is famous for its ruddy color, crisp taste, spicy and salty taste.