Nanjing's duck-blood glass noodle soup is very famous.
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粉丝 here means 'glass noodles' (usually mung bean starch) - not 'fans' as in pop culture. 粉丝汤 is a broth-based soup; the most famous version is Nanjing's 鸭血粉丝汤 with duck blood, tofu, and offal.
