Suan La Tang.

Name: Suan La Tang (Chinese Hot and Sour Soup)
Prep time: 20 min
Cook time: 20 min
Total time: 40 min
Yield: 4 servings
Cuisine: China
Ingredients: 15 g dried wood ear fungus; 6 dried shiitake mushrooms; 1.2 l chicken or vegetable stock; 150 g pork loin, in fine strips; 100 g bamboo shoots, drained and shredded; 250 g firm tofu, in matchsticks; 2 tbsp light soy sauce; 1 tbsp dark soy sauce; 1 tsp ginger, finely grated; 4 tbsp Zhenjiang black vinegar; 2 tsp ground white pepper; 3 tbsp cornstarch mixed with 5 tbsp cold water; 2 eggs, beaten smooth; 2 tsp toasted sesame oil; 3 scallions, thinly sliced

Chinese Hot and Sour Soup

酸辣汤 · Suān là tāng · say it: swan-lah-TAHNG

Hot and sour soup is a lightly thickened broth loaded with shredded wood ear fungus, bamboo shoot, shiitake and tofu, seasoned so the sourness of black vinegar and the dry heat of white pepper hit in that order, with egg drawn through in ribbons at the end. The texture is as much the point as the flavor: slippery fungus, springy bamboo, soft tofu and the faint body that cornstarch gives the broth, all in one spoonful. Crucially, the "hot" is pepper heat, not chili heat — it builds at the back of the throat and fades — which is why the soup tastes warming rather than fiery. It is a fast weeknight bowl built almost entirely from dried and jarred pantry ingredients.

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Chinese Hot and Sour Soup

Gate: ChinaNorthern China & Sichuan
Prep: 20 min
Cook: 20 min
Total time: 40 min
Serves: 4
Status: Easy
Nutrition / serving · estimated: Calories 210 kcal; Protein 16 g; Carbs 16 g; Fat 9 g; Fiber 3 g; Sodium 1250 mg

Why this recipe works.

Uses white pepper as the source of heat, which is what makes the soup taste like suan la tang rather than a generic chili broth.
Adds the vinegar in two stages, with the last spoonful off the heat, so the sourness stays bright instead of simmering flat.
Thickens the broth to coat a spoon and no further, avoiding the gluey takeaway texture most people know.
Built from dried mushrooms, wood ear and jarred bamboo, so it can be made from the cupboard at short notice.

Tips from our kitchen.

Soak dried wood ear in warm water for 20 minutes and expect it to swell to five or six times its dry volume — a small handful is plenty for four bowls.
Strain the mushroom soaking water through a cloth and add it to the stock. It carries most of the dried shiitake flavor and throwing it out is a real loss.
Grind white pepper fresh if you can. Pre-ground white pepper goes dusty and stale quickly, and this soup depends on it almost as much as on the vinegar.
Drizzle the beaten egg in a thin stream over the back of a spoon while the soup barely moves, then wait ten seconds before stirring, or you will get cloudy broth instead of ribbons.
Add the final tablespoon of vinegar after the pot is off the heat. Boiled vinegar tastes dull and flat, and the difference is immediately obvious side by side.
Taste at the end and adjust vinegar and pepper together, not one at a time — they balance each other and the soup should land sharp, savory and warming.

Substitutions.

Dried wood ear fungus → Extra shiitake plus a handful of enoki mushrooms: Nothing quite reproduces wood ear's crunchy-slippery texture, which is the reason it is there. It is cheap in Asian shops, keeps for years dry, and is worth seeking out.
Zhenjiang black vinegar → Rice vinegar with a splash of balsamic: Black vinegar is malty and rounded rather than sharply acidic. Straight white vinegar makes the soup thin and harsh, so cut it with a little sugar if it is all you have.
Pork loin strips → Chicken breast strips, or leave the meat out entirely: The soup is frequently made vegetarian in China; use a good mushroom stock and add a spoonful of soy sauce for depth if you skip the meat.

Variations.

Vegetarian suan la tang: Omit the pork, use vegetable or mushroom stock, and add extra tofu and bamboo. With the shiitake soaking liquid in the pot it loses very little savoriness.
With day lily buds: Soak a handful of dried golden needles (day lily buds) with the mushrooms and add them with the vegetables. They bring a faintly floral, tea-like note and are traditional in banquet versions.
Sichuan chili finish: Stir a teaspoon of chili oil into each bowl at the table for chili heat on top of the pepper heat. A common Sichuan restaurant touch, but keep the white pepper — it is not a replacement.

Storage & reheating.

Keeps 3 days refrigerated, though the cornstarch loosens as it sits and the egg ribbons soften. Reheat gently without boiling, then refresh with a teaspoon of black vinegar and a fresh grind of white pepper — both fade in the fridge and the soup tastes dull without them. Do not freeze: the tofu turns spongy and the thickened broth separates into water and starch on thawing.

Serve with

Steamed rice or a plate of pan-fried dumplings; in northern China this soup often turns up alongside jiaozi rather than before a main course.

The story behind Suan La Tang.

Hot and sour soup is claimed by more than one region, and the honest answer is that nobody settles it. Versions are strongly associated with Sichuan, where suan la tang usually leans on white pepper and vinegar and is served after a heavy meal, and with the north around Beijing and Henan, where thicker, darker bowls turn up as hu la tang, a peppery breakfast soup of an entirely different character. What the versions share is the pairing that gives the soup its name: sour from vinegar, hot from ground pepper, both added late so neither cooks off.

The combination is not arbitrary. Chinese food thinking treats sour and pungent as appetite-opening and warming, which is why this soup shows up in cold weather, at the end of banquets to cut through fat, and in the folk pharmacy as something to drink when a cold is coming on. The classic vegetable line-up — wood ear, day lily buds, bamboo shoot, dried shiitake — is a dried-goods roster, meaning a cook could make it in any season from what hung in the pantry, and the reconstituting liquid goes back into the pot as free stock.

Outside China the soup became a takeaway fixture and, in the process, often lost its way: cornstarch heavy enough to stand a spoon in, sweetness that has no business there, red chili oil floated on top for looks, and no wood ear at all. The version below stays close to the restaurant standard in China — thickened just enough to coat a spoon, sharp with Zhenjiang black vinegar, aggressively peppered, with a final splash of vinegar off the heat because vinegar loses its edge the moment it boils.

Questions, answered.

Why is my hot and sour soup not sour enough?

Almost always because the vinegar was added too early and boiled. Acetic acid is volatile, so simmering drives it off and leaves a flat, savory broth. Add half the vinegar during cooking for depth and the rest after the pot leaves the heat, then taste and adjust.

Where does the heat in hot and sour soup come from?

From ground white pepper, not chili. White pepper gives a dry, throat-catching warmth that builds and fades quickly, which is exactly the sensation the dish is built around. Chili oil is sometimes added at the table in Sichuan, but a soup made with chili instead of pepper tastes like something else.

Can I make it without cornstarch?

You can, and you will get a clear, brothy soup that tastes right but feels thin — the light body is part of the dish's identity. If you avoid cornstarch, potato starch or arrowroot both work; use slightly less arrowroot and add it off a hard boil, as it thins if overcooked.

What is wood ear and do I have to use it?

Wood ear is a dark, thin, ear-shaped fungus sold dried; soaked, it becomes slippery on the surface and crunchy at the edge, and it contributes texture rather than strong flavor. You can leave it out and use more mushrooms, but the characteristic bite of the soup goes with it.

How do I get proper egg ribbons instead of scrambled clumps?

Turn the heat to low so the surface barely moves, beat the eggs until completely smooth, and pour them in a thin stream over the back of a spoon while moving it across the pot. Let them set for about ten seconds untouched, then stir once. Pouring fast into a rolling boil is what produces clumps.

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