Pla Sam Rod (ปลาสามรส)

The Fish That Names Its Sauce

ปลาสามรส reads as it cooks: ปลา (pla), the fish; สามรส (sam rod), three flavours. But as Kapook's editors are careful to point out, the three are not equals. The sour leads — tamarind in the classic version — the sweet of palm sugar follows, and the heat trails behind as a murmur. Plenty of recipes leave the chilli out of the sauce altogether so children can eat it.

The dish travels under two names. Menus write ปลาสามรส, three-flavoured fish; home cooks say ปลาราดพริก, pla rad prik — fish with chilli poured over. The ราด (rad) is the technique, and it matters: the sauce is finished separately and poured over the fish on the plate, not in the wok, so the skin stays crisp under the glaze instead of softening in it.

Kapook's home-cook version opens with a wry observation: walk into any Thai restaurant and every other table seems to have one — and the price of ordering it is exactly why they wrote the recipe for making it yourself. Wongnai's cook adds the two rules that decide the dish: a fish patted bone-dry, and oil hot enough to sear it loose from the pan. Salt rubbed on the skin, they say, is what keeps it from sticking.

The Recipe (home version, from Kapook / TrueID)

The Wongnai shortcut pot: barramundi with a pounded paste of garlic, coriander root and prik jinda chillies, sauced with tamarind water, a cup of ready-made sweet chilli sauce (น้ำจิ้มไก่) and half a cup of water, simmered until thick. The Kruakhuntoi pot: Spanish mackerel (ปลาม้า) cut in chunks, dusted with crisp flour and fried in pork fat, tossed in a glaze of pounded garlic and yellow and jinda chillies with a whole cup of vinegar, salt and 300 g coconut sugar. The Wongnai UGC pot: sea bass sauced with chopped garlic, chilli, onion, pineapple and tomato in tamarind and palm sugar, the fish tossed through the sauce in the wok.

The Method

1. Prep the fish. Scale and gut it, then score (บั้ง) both sides — cuts almost to the bone, so the hot oil reaches every surface and the sauce finds crevices to run into. Pat it completely dry and rub with salt. TrueID's cooks are blunt about why: a wet fish is a fish that sticks.
2. The fry. Heat the oil very hot. Lay the fish in and fry the first side without moving it, five to six minutes — TrueID warns that flipping back and forth tears the skin before it sets, and that is how it sticks. Turn once, fry the second side slightly shorter, then drain on paper. For a shatter-crust version, Kapook's cooks dust the fish with crisp frying flour before it goes in.
3. The sauce. In a clean pan, fry the chopped garlic and chilli in a little oil until golden and fragrant — the smell of this step is the whole dish announcing itself. Add the tamarind water, palm sugar, fish sauce and water.
4. The reduce. Stir until the sugar melts, then simmer until the sauce turns thick and glossy — ข้นเหนียว in every source. Taste as it reduces: sour should still lead, sweet follow. It is ready when a spoon dragged through it leaves a trail that closes slowly.
5. The pour. Fish onto a plate, sauce over the top, coriander and sliced chilli to finish. Serve at once with hot rice — every source agrees the crisp is the point, and it will not wait.

Where Thai Sources Disagree

How Western Versions Get It Wrong

• Tomato ketchup or bottled sweet-and-sour sauce. Three-flavour sauce is tamarind sour, palm sweet and fresh chilli heat. Pour ketchup over fried fish and you have a takeaway sweet-and-sour, not pla sam rod.
• Heavy batter. The Thai way is scored and fried bare, or with a whisper of crisp flour. A fish-and-chips batter buries the skin crisp the dish is built on and turns the sauce into a sog.
• Flipping the fish repeatedly. TrueID and Wongnai both fry each side exactly once. Fussing with the fish is how it sticks, tears and steams instead of crisping.
• A watery pour. The sauce must be reduced until thick and glossy — ข้นเหนียว. A western version that sauces the fish with a thin liquid arrives with the crisp already gone.
• Balancing sour against sweet. In sam rod the sour leads on purpose. If you neutralise the tamarind until the sauce tastes even, the dish loses its name and its point.

UK Ingredient Notes

• Fish: sea bass or sea bream from any UK fish counter fry beautifully whole; tilapia, red snapper or frozen barramundi at Asian supermarkets. For the Kruakhuntoi version, ask for Spanish mackerel (ปลาม้า) steaks.
• Tamarind: block pulp soaked in warm water and strained, or ready-made tamarind paste at Thai grocers — both give the same sour.
• Palm sugar: solid discs or blocks at Asian supermarkets; grate it or soften it in the microwave before it goes in the pan.
• Chillies: red bird's eye chillies at Thai grocers do the job of prik jinda; a sliced red finger chilli makes the classic garnish.
• Crispy frying flour (แป้งทอดกรอบ): Thai crisp-fry mix at Asian supermarkets, for the flour-dusted versions. Optional — the classic recipe fries bare.

Sources

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