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1
Combine the coconut cream, palm sugar, and ½ tsp salt in a small saucepan and warm over a low flame, stirring, until the sugar dissolves completely — do not boil, or the cream will split and turn grainy. If using pandan leaf, lay it in during warming and lift it out before serving; it gives the sauce a faint grassy sweetness that threads through the finished dish. The sauce is ready when it tastes distinctly salty-sweet, more salty than intuition suggests is correct; remove from the heat and keep warm.
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2
Pour half the warm coconut cream sauce over the freshly steamed, still-warm sticky rice and fold gently to distribute. This is where the dish lives or dies: allow the seasoned rice to rest uncovered for 15 minutes, so the cream is drawn into every grain rather than pooling on the surface, and the mass becomes cohesive and richly flavoured throughout rather than sticky grains in a puddle. After the rest, the rice should appear slightly more opaque and unified, yielding and cohesive under a spoon; rice eaten before that point is simply unfinished.
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3
While the rice rests, hold each mango at arm's length and smell it, because a correctly ripe Nahm Dok Mai should announce itself from a distance — floral, tropical, insistently sweet. A mango that gives nothing to the nose at room temperature is either under-ripe or still refrigerator-cold; if cold, set it aside until it reaches room temperature fully, since the chill closes down the volatile aromatics that the dish depends on.
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4
Remove the two cheeks from each mango with a clean cut running close to the stone, so as little flesh as possible is lost. Score the flesh of each cheek in a crosshatch pattern without cutting through the skin, then invert each cheek so the scored cubes present outward; the flesh should be completely free of fibre and yield cleanly to the knife.
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5
Plate a mound of the rested coconut-cream-seasoned sticky rice and lay the mango cheeks alongside. Spoon the remaining warm coconut cream sauce over both rice and mango, finish with a small additional pinch of salt, and scatter toasted sesame seeds or toasted mung beans over the sauce. Serve immediately at room temperature, since cold rice and cold mango both suppress the aromatic qualities the dish is built on.