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1
Toast the dried bird's eye chillies in a dry pan over medium heat, stirring constantly until they darken and release their smoky, pungent aroma, then grind them coarsely — a rough grind keeps heat building on the palate rather than front-loading it. Toast the rice in the same dry pan until each grain is golden and smells nutty, then grind it to a fine powder so it will suspend evenly in the sauce and give it body. Have both components ready before the beef goes anywhere near the grill, so nothing interrupts the cook once the fire is at temperature.
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2
Build the nam jim jaew by combining fish sauce and lime juice first, then adding palm sugar and stirring until it fully dissolves so the sweetness integrates into the sauce rather than sitting beneath it. Stir in the toasted rice powder and chilli powder, then fold in the finely sliced shallot and finish with the fresh herbs last, so the heat of the sauce does not wilt them before serving. Rest the sauce for 10 minutes so the rice powder swells and the flavours tighten; the finished sauce should taste sour and lime-forward, with heat that builds, a deep savouriness from the fish sauce, and just enough thickness from the rice powder that it clings to the beef rather than pooling on the plate.
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3
Prepare the charcoal grill for direct, high heat, aiming for 400 °C or above — at this temperature the beef will sear immediately and take on the char and slight camphoraceous smoke note that define the dish rather than steaming in its own moisture. To verify the heat, hold a hand 10 cm above the grate; if you cannot hold that position for more than 2 seconds, the fire is ready. Season each steak with salt and white pepper only in the moment before it goes on the grill, not earlier, so the salt does not draw surface moisture that would impede the crust.
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4
This is where the dish lives or dies: lay the steaks on the grill and listen for an immediate, aggressive, continuous sizzle with occasional flares as fat renders onto the coals — if the sizzle is tentative or delayed the beef is sweating, not searing, and no subsequent adjustment will recover the crust. At the correct temperature, clean grill marks appear within 60 seconds and a fully browned crust develops between those marks within 2 minutes, accompanied by the characteristic smell of charcoal-grilled beef and a slight camphoraceous note from the smoke. Sustain that sizzle for the full cooking of the first side without moving the steaks, so the crust sets completely.
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5
Grill the first side for 2–3 minutes until a browned crust has fully formed between the grill marks, then turn the steaks once so the second side meets the same fierce heat and develops its own crust rather than merely warming through. Grill the second side for 2 minutes, then remove the steaks and rest them for 3 minutes so the juices redistribute to the centre and the meat relaxes enough to slice cleanly. The result is medium-rare.
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6
Slice the beef and serve immediately alongside the nam jim jaew. If the sauce pools on the plate rather than clinging to the beef, the proportion of toasted rice powder was insufficient.