Yum Ped Yang (ยำเป็ดย่าง)

The Salad That Rescues The Leftover Duck

ยำเป็ดย่าง is a Thai-Chinese dish with a Thai-Chinese origin story. The Pantip cook whose thread opens the topic is explicit about hers: the roast duck came home from the Chinese New Year offerings — ไหว้ตรุษจีน — and after the shrine had had its share, the rest went into the salad. That is the dish's whole logic: Cantonese-style roast duck is glorious hot, but a day later it is greasy and stiff — and Thai cooks have the exact remedy for rich, leftover meat. The hot-sour dressing.

The duck itself is not Thai at all. เป็ดย่าง is the Chinese roast duck — lacquered skin, anise and cinnamon through the meat — the same duck that tops the noodle shops. What makes the dish Thai is what happens to it: the meat is tossed in น้ำยำ, the sharp dressing of lime juice, fish sauce and chilli that defines every ยำ, then lifted with raw vegetables. Duckking, the Thai roast duck chain, publishes the dish on its own recipe page as one of its เมนูแซ่บ — its hot-and-spicy list — with the dressing weighed to the gram. The home version below does the same job with a bottle of sweet chilli sauce and a squeeze of ketchup, the way two BlogGang home cooks wrote it in 2010.

The Recipe (home version, from the BlogGang diaries)

The restaurant plate (Duckking): 120 g roast duck, 50 g onion, 50 g seeded tomato, 25 g spring onion, 25 g celery, with the dressing weighed at 45 g lime juice, 40 g fish sauce, 30 g sugar, 12 g chopped bird's eye chillies and 8 g chopped garlic — no ketchup, no sweet chilli sauce, and celery in the cucumber's place. Scale it up for the table. The leftover pot (Pantip): the New Year duck, deboned and seared in a pan until hot, dressed Isaan-style with lime, fish sauce, sugar, roasted rice powder (ข้าวคั่ว), shallots and coriander — the chilli left out because the cook's daughter does not eat hot food. The Lemon8 technique: warm the duck briefly and rest it before slicing, so it neither dries nor crumbles, and loosen the dressing with a spoon of the duck's own juices.

The Method

1. The duck. Slice the roast duck into bite-size pieces. If it has come out of the fridge, Lemon8's rule applies: warm it gently first — a short microwave or air-fryer pass — and rest it a couple of minutes before slicing, so the meat stays moist and holds together in the dressing.
2. The dressing. Stir the sliced bird's eye chillies, lime juice, chicken seasoning powder, fish sauce, sweet chilli sauce, ketchup and sugar together until the sugar dissolves. Taste it before it meets the duck — this is the whole dish's flavour, and it should read sour first, then salty, then hot, with the sweet tucked under.
3. Duck first. Toss the duck with the dressing before anything else goes in. The meat soaks the dressing up; the vegetables are there to catch what's left.
4. Vegetables last. Cucumber, onion, tomato, spring onion and coriander go in, and everything is tossed lightly — Lemon8 puts the tomato in last of all, because tomato is the first thing to weep water and flatten the dressing.
5. Plate and correct. Taste once more, then plate on the lettuce leaves and finish with coriander and sliced red spur chillies. Every source agrees on the final step: it is made just before eating, while the lime is still bright and the vegetables still snap. Hot rice alongside, or eat it as drinking food with extra lime and chillies on the table.

Where Thai Sources Disagree

How Western Versions Get It Wrong

• The wrong duck. The dish is built on Chinese roast duck (เป็ดย่าง) — lacquered skin, five-spice meat. Smoked duck breast or confit make a perfectly fine salad, but they are a different dish; the point is what the hot-sour dressing does to that specific, sweet, aromatic fat.
• Dressing at the table. A Western salad gets its dressing poured over at the end. This one is tossed duck-first — the meat soaks up the lime and fish sauce while the vegetables stay crisp. Dressing the bowl backwards leaves you with a wet salad and dry duck.
• Cold duck from the fridge. Lemon8 and Pantip both warm the duck first — gently, or seared in a pan. Fridge-cold roast duck is stiff and greasy, and the dressing slides off it.
• Bottled sweet-chilli dressing. The dressing is made in the bowl: lime, fish sauce, chilli, a little sugar. Even the BlogGang home version uses sweet chilli sauce as one part of a five-part dressing, never as the dressing itself.
• Sweetening it up. Western salad instincts push the sugar. Thai sources push back — the sugar is a teaspoon in a bowl of sour and salt. With sweet chilli sauce and roast duck already in the mix, more sugar just coats everything.
• Soggy vegetables. The vegetables go in last, and the tomato last of all. Tossing everything together from the start is how you get a bowl of pink water.

UK Ingredient Notes

• Roast duck (เป็ดย่าง): a Cantonese roast duck from a Chinatown barbecue counter or an Asian grocer's hot counter is the thing — skin lacquered and crisp. Leftover Chinese New Year duck is traditional, and the Pantip cook's whole recipe assumes it.
• Sweet chilli sauce (ซอสพริก): the thin, glossy Thai-style bottle used for fried chicken, not the lumpy Western table condiment.
• Chicken seasoning powder (ผงปรุงรสไก่): Knorr or RosDee chicken powder at any Thai or Chinese grocer.
• Roasted rice powder (ข้าวคั่ว) for the Isaan version: toast raw jasmine rice in a dry pan until it smells nutty and grind it — or buy it ready-ground at Thai grocers.
• Cucumber: an English cucumber is fine; the shorter Thai-style ones at Asian grocers are closer to the original. Coriander with the roots still on, if you can get it.

Sources

This recipe is translated from the following Thai-language sources. Where they disagree, we've said so.