Suan cai yu originated in Chongqing (then part of Sichuan province before Chongqing became a separate municipality in 1997), where the local eating culture around river fish and fermented vegetables produced this particular combination in the early 1990s. Unlike many Sichuan dishes with ancient documented origins, suan cai yu is relatively new — documented as a dish from the 1980s and 1990s — but it spread rapidly and is now a national Chinese restaurant staple. The fermented mustard green — yacai (crushed, salt-fermented) or suan cai (whole-leaf, brine-fermented) — is the defining ingredient; its sour, slightly funky flavor is what gives the broth its backbone.
The dish is one of the cleaner expressions of Sichuan flavor: it is less oily than many Sichuan preparations, the sourness from the fermented vegetable providing brightness that sheer chili oil does not. The fish itself is delicate — the velveting ensures it remains tender against the aggressively flavored broth.
The Fish: Selection and Velveting
Fish selection: White-fleshed river fish in China (grass carp, silver carp, black carp); in Western markets: tilapia, catfish, basa, or any firm white fish works. The fish must have some firmness — very delicate flaky fish (sole, flounder) will fall apart.
Filleting and slicing: The fish is filleted; bones removed; sliced thinly on a bias (3–4mm thick, about 5cm wide). Thin slices cook quickly in the hot broth and are more delicate to eat.
Velveting: The essential technique:
- Egg white: 1 per 300g fish
- Cornstarch: 1 tablespoon
- Shaoxing rice wine: 1 teaspoon
- Salt: a pinch
- Mix; coat fish slices gently; marinate 15–20 minutes
The egg white and cornstarch create a protective coating that:
- Prevents the fish from directly contact with the aggressive hot broth (reducing toughening)
- Creates a silky exterior texture as the coating gels in the hot liquid
- Slightly thickens the broth at the edges of the fish
Poaching, not boiling: The fish is slipped into simmering (not boiling) broth; it cooks in 60–90 seconds. Boiling breaks the velvet coating and toughens the fish.
The Pickled Mustard Greens (Suan Cai)
What it is: Sichuan fermented mustard greens — available at Chinese grocery stores in jars or vacuum bags, labeled yacai (碎) or suan cai. The flavor is sharp, sour, and slightly funky — not the same as Western sauerkraut, though sauerkraut can approximate it in a pinch.
How it is used: Rinsed (to reduce excess saltiness), then stir-fried in oil with ginger and garlic before the broth is added. The stir-frying mellows the raw fermented flavor and develops the sour compounds into the oil.
The quantity: Generous — the suan cai is a major flavor component, not a background note.
Suan Cai Yu vs Shui Zhu Yu
| | Suan Cai Yu | Shui Zhu Yu | |---|---|---| | Dominant flavor | Sour (fermented vegetable) + spicy | Spicy (chili oil heavy) | | Finish | Hot chili oil poured over | Very large amount of chili oil poured over | | Vegetable | Pickled mustard greens | Bean sprouts or cabbage | | Sourness | Prominent | Absent or very minor | | Richness | Moderate | Very heavy (chili oil) |
The Complete Recipe
Serves: 4 | Time: 45 minutes
Velveted Fish
- 500g white fish fillets (tilapia, grass carp), sliced thinly on bias
- 1 egg white
- 1 tablespoon cornstarch
- 1 teaspoon Shaoxing wine
- Pinch of salt
Broth
- 200g suan cai (Sichuan pickled mustard greens), rinsed and roughly chopped
- 6–8 dried red chilies (facing heaven chilies or similar)
- 1 tablespoon Sichuan peppercorns
- 4 slices fresh ginger
- 4 garlic cloves, smashed
- 3 tablespoons neutral oil
- 800ml chicken broth or fish broth
- 1 tablespoon Shaoxing wine
- Salt to taste
To Finish
- 3 tablespoons chili oil (with sediment)
- 1 teaspoon ground Sichuan pepper
- Fresh cilantro or scallion
Method
1. Velvet fish: Combine egg white, cornstarch, Shaoxing wine, and salt; add sliced fish; toss to coat gently. Rest 15 minutes.
2. Build the broth: Heat 3 tablespoons oil in a wok or pot over medium-high. Add ginger and garlic; stir-fry 30 seconds. Add rinsed suan cai; stir-fry 2–3 minutes until fragrant and slightly dried out. Add dried chilies and Sichuan peppercorns; stir 30 seconds. Add Shaoxing wine; stir.
3. Add broth: Pour in chicken broth; bring to a boil; reduce to a simmer; cook 10 minutes to develop flavor. Taste; adjust salt.
4. Poach fish: Reduce heat so broth is simmering gently (not boiling). Slide fish slices into the broth one at a time; cook 60–90 seconds until fish is just opaque. Do not stir aggressively.
5. Transfer and finish: Transfer to a serving bowl. Mix chili oil, ground Sichuan pepper. Pour hot chili oil mix over the surface. Add fresh cilantro or scallion.
Serve: With white rice.
Related reading: Sichuan Water-Boiled Beef Shui Zhu Guide | Mapo Tofu Sichuan Guide | Dan Dan Noodles Sichuan Guide
The full recipes live in the book.
Get Tokyo Meets Tuscany on AmazonPaperback $24.99 · Hardcover $34.99 · eBook $9.99