Kaeng Phed Pet Yang (แกงเผ็ดเป็ดย่าง)

The Curry That Marries Chinatown To The Red Paste

The name reads simply: แกงเผ็ด (kaeng phet) is the hot red curry, and เป็ดย่าง (pet yang) is roast duck — the Cantonese-style bird hanging in every Chinatown shop window, lacquered and smoked. The dish is the meeting point of the two: a red curry built around an already-cooked duck, where the curry's job is not to cook the meat but to dress it.

Aroifin's editors note you rarely see the dish for sale — roast duck is one of the pricier proteins, so the curry stays a home or special-occasion dish. But it is fast: with a shop-bought duck, the whole pot comes together in half an hour. Phol Food Mafia's recipe, from the TV cook อาจารย์ศรีสมร คงพันธุ์, adds the historical detail — the dish was originally called simply แกงแดง (kaeng daeng, "red curry"), before the roast duck claimed the name.

The defining move is the fruit. Where a chicken red curry would carry bamboo shoots or aubergines, this one carries pineapple, tomatoes and — in several sources — red grapes, simmered until the curry turns genuinely sweet-sour. Every source explains it the same way: the duck is rich, and the acid of the fruit is what keeps the coconut cream from cloying. Aroifin is explicit: pick a sour pineapple, and be careful not to split too much oil out of the coconut cream — the duck already brings its own.

The Recipe (home version, from Wongnai / Aroifin)

The chef's pot (Phol Food Mafia): the duck is first simmered three minutes in boiling thin coconut milk — to soften the meat and tame the smell — then fried a minute in the split paste before the thin coconut milk goes in; pineapple juice joins the fruit, and the tomatoes are halved crossways and added with the basil only thirty seconds before the pot comes off the heat. The from-scratch pot (Krua Khun Toi): the show marinates its own cherry duck — coriander root, thirty cloves of garlic, white pepper, both sugars, fish sauce — grills it, and pounds its own paste with roasted coriander seed, cumin and kaffir peel; the curry takes over an hour and feeds eight. The from-scratch paste (Krua.co): dried chillies, galangal, lemongrass, kaffir peel, coriander root, shallots, ten Thai garlic cloves and shrimp paste, pounded with roasted coriander seed, cumin and white pepper — 300 g of red grapes go in with the fruit.

The Method

1. The duck. Cut the roast duck into thick slices, knife going through the flesh down to the skin — Phol Food Mafia warns that cutting from the skin side first can pull the skin off the meat. Keep the bones; they add body to the curry.
2. The paste. Fry the curry paste in a little coconut cream over medium-low heat, adding the cream in spoonfuls until the paste smells deep and the oil starts to bead. Aroifin's caution: do not chase the full oil-split you would give a chicken curry — roast duck is already fatty, and too much split oil makes the dish cloying (เลี่ยน).
3. The fruit. Pour in the thin coconut milk, then add the pineapple, pea aubergines, cherry tomatoes and grapes. Simmer gently — Wongnai gives it twenty minutes on low heat until the curry thickens and the sweet-sour flavour builds.
4. The seasoning. Fish sauce for salt, palm sugar for roundness. If the pineapple was riper than you wanted, correct with a spoon of tamarind water the way TrueID and Krua Khun Toi do.
5. The duck goes in late. The duck is already cooked; it needs only to warm through and give its juices to the sauce. Add it with the torn kaffir lime leaves and sliced red chillies for colour, and hold the boil to a simmer.
6. The finish. Off the heat, stir in the Thai basil at the very last moment — Phol Food Mafia allows it only thirty seconds, or the basil blackens and the tomatoes collapse. Serve with hot rice, or with khanom jeen as Aroifin and the Phol recipe suggest.

Where Thai Sources Disagree

How Western Versions Get It Wrong

• Any old duck. The dish is named for the roast duck — เป็ดย่าง. Pan-fried breast or confit legs make a different, blander curry. The smoke and the lacquered skin are the point, and Phol's recipe is built around the bird from the Chinese shop.
• A generic red curry paste. The original แกงแดง paste carries nutmeg and aromatic ginger (เปราะ). Phol Food Mafia's shortcut for a market paste — half a teaspoon of ground nutmeg and a teaspoon of roasted ground เปราะ — is the difference between this curry and any other kaeng phet.
• No fruit. A red curry with duck and no pineapple, tomatoes or grapes is just a hot duck soup in coconut milk. The sweet-sour fruit is the balance against the fat; without it the curry reads heavy from the first spoon.
• Boiling the duck to shreds. The duck is cooked before it enters the pot. It needs ten minutes of gentle warmth, not forty of simmering — long boiling dries the meat and clouds the curry.
• Chasing the oil split. Western curry habits say fry the paste until the oil separates, always. Aroifin says the opposite for this dish: split it lightly, because roast duck carries fat of its own and a fully split cream turns the curry cloying.
• Basil simmered in. Thai basil goes in after the heat is off — thirty seconds at a rolling boil and it blackens. The same goes for Phol's tomatoes, which collapse if they are stewed too long.

UK Ingredient Notes

• Roast duck: Cantonese-style roast duck from a Chinatown butcher or Asian supermarket — half a duck is the standard measure. Failing that, a home-roasted duck (Gressingham, five-spice rub) gets you close; the smoke matters less than the rendered skin.
• Red curry paste: Thai-brand jars at Asian grocers and most supermarkets; if you use a market-style paste, add the nutmeg and เปราะ Phol recommends — aromatic ginger (Kaempferia galanga) is sold as kencur in Indonesian shops and as เปราะ at Thai grocers.
• Pea aubergines (มะเขือพวง): fresh at Thai grocers when in season, frozen year-round; leave them whole.
• Pineapple: choose the firmest, least ripe one you can find — the recipe wants sour. Tinned pineapple in juice works, but use the juice too, the way Phol does.
• Thai basil (ใบโหระพา): at Thai grocers and some large supermarkets; ordinary basil is a distant substitute.
• Red grapes: seedless red grapes halved, per Wongnai and Krua.co.
• Kaffir lime leaves: frozen at Thai grocers; for the from-scratch paste you will also want galangal, lemongrass, shrimp paste and dried chillies — all standard Thai-grocer stock.

Sources

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