Duck Blood and Vermicelli Soup in Nanjing: What to Order, What to Avoid

Overview

Duck blood and vermicelli soup — yāxuè fěnsī tāng — is Nanjing’s other duck dish, the one eaten standing at a stall rather than carried home wrapped in paper. Where salted duck is festive, bought whole and shared, this is a single bowl: cubes of set duck blood, a tangle of glass-clear vermicelli made from mung-bean or sweet-potato starch, and a broth built on duck bones, usually finished with a handful of the bird’s other offal — liver, gizzard, sometimes intestine — plus fried tofu puffs soaking up the broth, and a scatter of scallion and coriander.

It belongs to this city for the plainest possible reason: nowhere eats this much duck, and a city that goes through ducks in these quantities has to do something with the parts that don’t go into the roasting or salting pans. The blood is set into a firm, faintly grainy curd — closer in texture to a soft egg custard than to anything jellied — and the offal that would otherwise be trimmed and sold cheap or discarded becomes the point of the dish rather than an afterthought. It reads as frugal food because it is: a way of eating the whole animal that happened to become genuinely good.

There is no legal designation attached to it and no single dated origin story worth repeating as fact — no royal visit, no named cook. What there is instead is simply a very old, very ordinary habit: a hot bowl eaten early in the day or as a between-meals snack, sold from the same kind of stall it has always been sold from.

What to order

The base bowl is duck blood and vermicelli in duck broth; almost everywhere that sells it lets you build from there, and the choices are worth knowing before you’re at the counter.

Offal is usually optional rather than automatic — a stall will ask, in one way or another, whether you want it left in or left out. Left in is the fuller, more traditional bowl: liver adds iron and a slight bitterness, gizzard adds bite, intestine (when it’s offered) adds richness. A bowl with none of it is lighter and cleaner but is, honestly, the abridged version.

Spice is added at the table, not cooked in: a spoon of chilli oil is the normal way to heat the bowl up, and asking for it on the side rather than stirred through lets you control how much. A vinegar or pepper condiment often sits alongside it for the same reason — this is a soup built to be adjusted after it arrives, not before.

A distinguishing addition at some stalls is a crumbled fried cracker or dough fritter dropped in at the end. It softens fast, so it’s added last — eat the bowl promptly once it’s in, because that crunch is the entire reason it’s there rather than a garnish you can leave for later.

Bowl size is usually a simple large-or-small choice, and the small one is a proper single serving rather than a taster — this is a snack, not a course, and ordering the small bowl marks nobody out.

What to avoid

The single most useful thing to know about this dish is that duck blood, as an ingredient, has a documented fraud problem in China: blocks sold as duck blood that are diluted, bulked with starch and additives, or made from a cheaper animal’s blood entirely and coloured to match. None of this is specific to any one stall or any one city — it’s a known weak point of the ingredient itself, and it’s worth knowing what the real thing feels like in the mouth so you can tell.

Genuine duck blood curd is soft and slightly grainy, closer to a firm custard than to rubber: it should break apart under a spoon rather than bounce back from it. A block that is uniformly smooth, glossy and springy — more like a gummy sweet than a set liquid — is the texture of the adulterated version, not a firmer, better one.

The broth is the second tell. A bowl made properly has a pale, faintly cloudy broth with a visible sheen of duck fat on top and a real depth from the bones; a broth that is thin, very clear and tastes the same as every other hot soup nearby has usually come from bouillon powder rather than a pot of duck bones. If the offal in the bowl looks grey and slightly dry rather than freshly cooked, it has been sitting rather than made to order — and a bowl that is heavy on vermicelli and thin on both blood and offal is the version built to be cheap to fill rather than to be right.

Soggy, overcooked vermicelli that has gone starchy and clumped is a sign of a batch made hours earlier and reheated, not of an ingredient fault — fresh vermicelli stays slightly springy even after sitting in hot broth for a few minutes.

Practicalities

This is inexpensive food: a regular bowl runs roughly ¥10 to ¥20, a little more with extra offal or the fried topping added. A price meaningfully above that near a busy tourist street is usually the offal being charged separately at a markup rather than a different dish.

It is eaten at any hour rather than tied to one meal, though it leans towards breakfast and the early evening, when stalls sell through a fresh batch rather than one that has been sitting. It’s a cooler-weather comfort as much as anything — a hot bowl of broth and offal reads better on a damp winter morning than in the middle of a humid summer afternoon, though it’s sold year-round regardless.

It’s a stand-or-sit-briefly dish, not a restaurant order: expect a bowl, a plastic stool, and a turnover measured in minutes rather than a menu and a wait. Payment habits follow the rest of the city’s food stalls rather than differing for this dish specifically.