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1
Spoon the taek man — the thick, separated coconut fat — from the top of the first tin into a wide, heavy-based pot or Dutch oven set over medium heat. When the fat liquefies and begins to shimmer, add the beef sections in a single layer without crowding, working in batches if necessary, so each surface makes full contact with the hot metal and builds a deep mahogany crust rather than steaming grey in its own moisture. The crust, not the interior, is the object; the braise will complete the cooking, so remove the beef and set it aside once every surface is coloured through.
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2
Reduce the heat to medium-low and add the massaman curry paste directly into the residual taek man fat in the pot. Fry, pressing and folding the paste continuously until it darkens by one shade, releases its aromatics fully, and the fat visibly separates around the edges — a ring of orange-tinged oil forming at the perimeter — so the dried spices and chillies inside the paste open completely and no raw, floury catch lingers on the palate. This is where the dish lives or dies; an under-fried paste produces a raw, gritty sauce that no length of braising will correct.
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3
Return the seared beef to the pot and add the whole spices — cardamom, cinnamon, star anise — then pour in the remaining coconut milk and sufficient water to just submerge the beef, so the whole spices have room to steep through the full volume of liquid rather than concentrating in one corner. Add the palm sugar and stir to incorporate, then add the pearl onions, bring to a gentle simmer — a slow, lazy roll at the surface, not a boil — cover, and braise over the lowest possible heat or in an oven set to 150 °C; the sauce should show a pale amber at this stage.
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4
At 2 hours, add the tamarind water and stir it in, tasting immediately so you can judge the balance before the acid cooks further into the sauce — the mild sweetness from the palm sugar should already have developed, and the tamarind should cut cleanly through it and begin to pull the flavours into alignment. The colour will deepen noticeably at this point. Cover and continue braising.
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5
At 3 hours, add the potato cubes and ensure they are submerged in the braising liquid, so they absorb the spiced sauce as they cook rather than steaming unevenly above it. The liquid at this point should have reduced to a coating consistency — it should hold on the back of a spoon without running off immediately. Cover and continue braising.
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6
At 4 hours, add the roasted peanuts and stir gently to distribute; the beef should offer no resistance when pressed with the back of a spoon — it yields completely but has not disintegrated — and the potatoes should hold their shape with their edges intact. Remove the lid for the final portion so the surface is exposed to the air and the sauce tightens further, and continue for a minimum of 30 additional minutes.
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7
Remove from heat and add the fish sauce now and only now, so its sharp saline edge is not driven off by prolonged heat and its full seasoning force registers clearly in the finished sauce — taste for balance, checking that sweetness, sour, salt, and the long warmth of whole spice sit in equal measure with no single element dominant. Remove and discard the cinnamon stick, cardamom pods, and star anise, then allow the curry to rest uncovered to room temperature before refrigerating overnight; reheat gently the following day, when the sauce will have tightened and the flavours will have drawn together considerably.