What Is Duck Blood Soup? Chinese Duck Blood and Vermicelli Soup

Type duck blood soup into a search bar and the results cannot agree on what it is. One version is Polish and sweet-sour, thickened with dried fruit. Another is Vietnamese and made with raw blood pudding. This guide focuses on the Chinese one: duck blood and vermicelli soup (鸭血粉丝汤, ya xie fen si tang), a warm Nanjing street-food dish of glass noodles, cooked duck blood, duck offal, and savory broth.

If the name is what brought you here, the reassuring part comes first: the duck blood in the Chinese dish is cooked, mild, and closer to soft tofu than to anything you are bracing for. In China it is ordinary food, the kind of thing people order without a second thought at a hotpot table or a noodle stall.

What Is Duck Blood?

Duck blood (鸭血, ya xie) is exactly what it sounds like, but the form is the part that matters. The blood is collected, lightly salted, and gently cooked until it sets into a firm, jelly-like block, not unlike a darker, softer tofu. Sliced into cubes or thin sheets, it holds its shape in hot broth and soaks up whatever it is simmered in.

In English you will sometimes see it sold as blood tofu or blood curd, named for that texture. In spicy Sichuan cooking the same ingredient turns up as xuewang (血旺). Its color is a deep brownish maroon rather than the bright red the word blood brings to mind, and once set it is solid and sliceable, without the liquid texture people imagine.

What Does Duck Blood Taste Like?

Milder than almost anyone expects. On its own it is faintly mineral and mostly neutral, with a smooth, custardy texture that breaks cleanly and slips down easily. It is not chewy, not gamey, and not strongly flavored. Most of what you taste comes from the broth around it, which it absorbs like a sponge, so a good bowl tastes of the soup far more than of blood. The first bite is usually the moment a nervous eater relaxes, because there is so little drama in it.

Further Reading: The Smelly Street Food That Became a National Obsession

Is Duck Blood Safe to Eat?

Properly cooked duck blood from a reliable food source is treated much like other cooked animal products. In Chinese duck blood soup and hotpot, the blood is set into a block and heated in broth before eating.

The food-safety question is mostly about raw or undercooked blood, not about duck blood itself. Raw blood dishes exist in some food traditions, but health authorities warn against eating raw blood because it can carry bacteria and viruses. That is a different situation from Chinese duck blood and vermicelli soup, where the blood should be cooked through.

Is Duck Blood Good for You?

Duck blood is often described in Chinese food culture as plain but nourishing. Nutritionally, it can be a source of protein and iron, though exact values depend on the product and how it is prepared. The blood itself is not usually the heavy part of the bowl; the noodles, broth, oil, and toppings matter too. Treat it as one ingredient in a varied diet, not as a health supplement.

What Is Duck Blood and Vermicelli Soup?

This is the Chinese dish this guide is focused on, and it belongs to Nanjing. Duck blood and vermicelli soup (鸭血粉丝汤) pairs slippery vermicelli (粉丝, fen si) — thin glass noodles made from mung bean or sweet potato starch — with a light duck broth, cubes of duck blood, and usually a mix of duck offal such as liver, gizzard, and intestine. It is finished with fried tofu skin, a pinch of dried shrimp, white pepper, sesame oil, and a generous handful of coriander, with chili oil added at many stalls.

Nanjing has a long duck-cooking tradition. A local origin story says a cook once added vermicelli to duck blood by chance and found the combination worked. The food folklore does capture the spirit of the dish: simple ingredients turned into a warm, comforting street-food bowl.

Now it is everyday street food there, eaten for breakfast, lunch, or a late-night snack. It is best eaten fresh, since the noodles swell if they sit too long. That is one reason instant packets exist: they make a local bowl easier to carry home, even if they cannot fully replace a shop version.

The duck blood itself is not unique to this bowl. It is a regular order in hotpot, where cubes of it cook in the simmering pot, and it anchors spicy Sichuan dishes too. The Nanjing soup is just its gentlest, most comforting home.

Duck Blood Soup Around the World

Because the English name is so broad, it helps to know the other dishes it can point to, especially if a recipe you find does not look like the Chinese one.

In Poland and nearby countries, czarnina, also spelled czernina, is a duck blood soup too, but it is a very different dish. It is usually built on duck broth, duck blood, vinegar, and dried fruit, giving it a sweet-sour flavor that feels far removed from a Chinese noodle soup.

In Vietnam, tiet canh is a raw blood pudding, often served with herbs and peanuts. It belongs to a different food tradition, and because it is raw, it carries different food-safety risks from cooked duck blood dishes. So when a recipe calls itself duck blood soup, it is worth checking which tradition it comes from. This guide is about the cooked Chinese one.

Where to Buy Duck Blood

In many Chinese or Asian supermarkets, duck blood is sold refrigerated or frozen, usually in blocks or tubs labeled duck blood or blood tofu. If duck is hard to find, pork blood is sometimes sold in a similar form and can be used in similar soups, though the flavor and texture are not exactly the same. For the noodles, look for Chinese-style mung bean vermicelli or thin sweet potato vermicelli. Avoid thick Korean sweet potato noodles here; they are delicious in their own dishes, but they do not give the same light, slippery texture as Nanjing duck blood and vermicelli soup.

How to Make Duck Blood and Vermicelli Soup at Home

You can get close to a Nanjing bowl without much fuss, and the method is forgiving.

Start with a light, savory broth. Duck stock is closest, but chicken stock also works for a home version. Keep the broth gentle rather than heavy, because Nanjing duck blood and vermicelli soup is not meant to taste like hotpot. Bring the broth to a gentle simmer and add your soaked vermicelli. Slice the duck blood into bite-sized cubes and lower them in, then keep the heat low and warm them through rather than boiling them hard. Add any cooked duck offal you have, then finish with white pepper, a few drops of sesame oil, and plenty of coriander. A little chili oil is optional if you want more heat.

The single technique that matters is gentleness. The duck blood is already cooked, so it only needs heating; a rolling boil turns its soft, custardy texture rubbery. This is the same reason it goes into a hotpot near the end rather than the start.

Duck Blood Soup FAQ

Is Duck Blood the Same as Blood Tofu?

Mostly, yes. Blood tofu is just an English nickname for the same cooked, coagulated blood, named for its soft, tofu-like texture. It can be made from duck, pork, or chicken blood, and it is used the same way in soups and hotpot.

Can You Eat Duck Blood Raw?

No. In Chinese duck blood soup and hotpot, duck blood should be cooked or heated through before eating. Raw blood dishes exist in some cuisines, but raw blood can carry bacteria and viruses, so it is not something to try at home. Properly cooked duck blood gives you the same mild texture without the same raw-blood risks.

What Is Duck Blood Called in Chinese?

Duck blood is 鸭血. With tone marks, the pinyin is yā xiě; without tones, write it as ya xie. The Nanjing soup is 鸭血粉丝汤, yā xiě fěn sī tāng, or duck blood and vermicelli soup. In spicy Sichuan cooking, cooked blood curd is often called 血旺, usually written as xuè wàng in pinyin.

Does Duck Blood Soup Taste Like Blood?

Not really. The blood is mild and takes on the flavor of whatever it cooks in, so the bowl comes across as savory and peppery rather than metallic. The duck broth and vermicelli carry most of the taste.

For all the alarm the name sets off, duck blood soup is gentle food: a warm, peppery bowl built from an ingredient many kitchens would throw away. That thrift is part of its charm, and part of why the dish is worth knowing.

If this helped make duck blood sound less intimidating, share it with someone who likes learning about Chinese street food. For other foods that unsettle newcomers more than they should, read about the century egg and stinky tofu. For more plain-English guides to Chinese food, language, and daily life, join the Stellar Chinese email list.