Oil-Blast Shrimp
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Zao Lu River Prawns
River prawns boiled, ice-shocked, then steeped cold in a homemade fermented-rice lees brine until wine-fragrant. Adapted for a home kitchen from the original ClouChef R&D report — 糟卤罗氏虾, report 201.
Original poster image from clouchef.com (poster: 糟卤罗氏虾_201.jpeg). This is the hero poster only, not a step-by-step photo set.
Prep: 48 hoursCook: 3 minutesTotal: 48 hours 15 minutesServings: 2Difficulty: EasyRegion: ShanghaiFlavour: Wine-fragrant, lightly sweet, savoury (zao lu)
Why this works
Zao lu is Shanghai's cold answer to a hot kitchen: the cooking takes three minutes, the flavour takes two days. The report's brine is made from scratch — fermented rice lees mixed with yellow wine at one to three, sealed and left forty-eight hours, then filtered twice until clear — because bought brine varies wildly in salt and sweetness, and the prawns will absorb exactly what they sit in. The steep is timed as tightly as the boil — two hours, plus or minus fifteen minutes, never more than three — because an extra hour in brine does not add flavour, it adds salt. Served cold, drained, with a coriander garnish, these prawns taste clean, wine-fragrant and faintly sweet, and they are the kind of cold dish that makes a summer table feel complete without any cooking on the day. A cold plate and a final coriander garnish complete a dish that needs no cooking on serving day.
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Ingredients
| Ingredient | US | Metric | Substitute / note |
|---|---|---|---|
| River prawns (luoshi xia), about 400 g | 14 oz | 400 g | About 0.8 jin; large freshwater prawns or king prawns work (adaptation). |
| Homemade zao lu brine | About 2 cups | 500 ml | Made from fermented rice lees and yellow wine at 1:3, fermented 48 hours and filtered twice; see steps. Ready-made zao lu from a Chinese grocery is an alternative (adaptation). |
| Scallion segments | 0.35 oz | 10 g | For the boiling water. |
| Ginger slices | 0.35 oz | 10 g | For the boiling water. |
| Yellow wine, extra | 4 tsp | 20 ml | For the boiling water. |
| Coriander leaves, for garnish | 0.07 oz | 2 g | — |
| Ice water, for shocking | About 4 cups | 1000 ml | At 0 to 4 °C. |
Equipment
- Large pot
- Bowl of ice water
- Glass jar with a sealable lid, for the brine
- Fine muslin or cheesecloth, for filtering
Steps
- Make the brine 48 hours ahead. Mix fermented rice lees with yellow wine at 1:3 in a glass jar, seal, and leave in a cool, dark place for 48 hours. Filter through fine muslin twice until the brine is clear. Under-fermented brine tastes flat; over-fermented brine turns sour.
- Boil the prawns. Trim the prawns: rinse under running water and snip off whiskers and rostrum. Bring a pot of water to a boil with ginger, scallion and 20 ml yellow wine. Add the prawns and boil on high heat 3 minutes until the shells turn red and the meat is fully opaque.
- Ice-shock. Lift the prawns at once into ice water at 0 to 4 °C and soak 10 minutes until completely cold. This sets the springy texture and stops them absorbing too much salt later. Drain well.
- Steep cold. Submerge the drained prawns completely in the filtered brine and refrigerate at 4 °C for 2 hours (plus or minus 15 minutes; never more than 3 hours, or they turn too salty).
- Serve. Lift the prawns out, drain off excess brine, arrange on a plate and garnish with coriander leaves. Serve cold. Prawns must be fully cooked before steeping — never steep raw prawns (report safety point).
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Technique: two hours in brine, not three
The steep is the only seasoning these prawns get, so its length is the recipe: under two hours they taste plain, over three hours they taste only of salt. The ice shock matters just as much — it firms the meat so it stays springy through a cold steep instead of turning soft. And the brine must be filtered twice: any lees sediment left in clouds the prawns and dulls their appearance.
Variations
- Ready-made brine: use bottled zao lu and steep 1 to 2 hours, tasting one prawn at 1 hour, since commercial brines vary in salt (adaptation).
- Other seafood: the same brine suits cooked chicken wings or edamame, steeped the same way (adaptation).
Frequently asked questions
Can I steep raw prawns in brine?
No — the prawns must be fully boiled first. Zao lu is a flavouring steep, not a cure, and raw prawns in brine are a food-safety risk.
Why are my prawns too salty?
They steeped longer than 3 hours, or the brine was not drained well. Keep to 2 hours and drain before serving.
Where do I buy fermented rice lees?
Chinese groceries sell zao ni in jars; ready-made zao lu brine is the easier alternative.
Storage and freezing
Eat within 1 day of steeping, kept refrigerated at 4 °C. Do not re-steep leftovers and do not freeze — the texture turns soft. Discard brine after one use.
Zao Lu River Prawns — Recipe Card
River prawns boiled, ice-shocked and steeped cold in wine-fragrant fermented-rice brine.
Prep: 48 hoursCook: 3 minutesTotal: 48 hours 15 minutesServings: 2
Ingredients: 400 g river prawns; 500 ml homemade zao lu brine (lees and yellow wine 1:3, 48 hours, filtered twice); 10 g scallion; 10 g ginger; 20 ml yellow wine; 2 g coriander; 1000 ml ice water.
Steps: 1) Make brine 48 hours ahead. 2) Boil prawns 3 minutes. 3) Ice-shock 10 minutes. 4) Steep 2 hours cold, drain and serve.
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Source note: ingredients, quantities and steps are adapted from the original ClouChef R&D report for 糟卤罗氏虾 (data/reports/201.md). The report's pricing, margin and marketing sections are deliberately omitted here; no B2B cost is presented as a home-cook cost. The report's cost table is arithmetically wrong (one line item alone exceeds the stated total by far), so no cost figures are reproduced. The ready-made brine alternative and prawn substitution are home adaptations and are labelled as such. Original poster image: clouchef.com (糟卤罗氏虾_201.jpeg).