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1
Combine all spice paste ingredients in a stone mortar or blender. Grind or process to a smooth, cohesive paste. The paste is ready when no coarse threads of lemongrass or fibrous shards of galangal remain — the texture is uniformly dense and the colour a deep, saturated ochre.
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2
Heat the oil in a heavy pot over a medium flame. Add the spice paste and fry, stirring constantly, until the rawness has cooked out entirely. This is where the dish lives or dies: the paste must fry long enough — pressing it against the pot — that the oil separates visibly around its edges and the room fills with a roasted, fragrant heat rather than a sharp, raw smell. Undercooked paste produces a flat, harsh broth; scorched paste cannot be recovered.
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3
Pour in the stock and stir to lift any paste adhering to the base of the pot. Bring to a gentle simmer. Add the coconut milk and coconut cream. Maintain a low simmer — never a rolling boil — stirring occasionally. The broth is ready when it is uniformly golden, aromatic, and has a silken body; any prolonged boiling will cause the coconut milk to split and the broth to appear greasy and curdled.
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4
Add the prawns to the simmering broth. Poach gently until they are just opaque through — cut the thickest prawn across its centre; the flesh should be uniformly white with no translucent grey at the core.
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5
Season with salt. Taste the broth: it should be rich, rounded, and carry the forward warmth of chilli balanced by the sweetness of coconut. Adjust salt as needed.
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6
Divide the soaked rice noodles among four deep bowls. Ladle the hot broth and prawns over the noodles. Arrange bean sprouts, halved eggs, and laksa leaves on top. Finish with sliced red chilli. Serve at once with lime wedges alongside. The noodles are correctly presented when they are submerged in broth and the garnishes sit proud above the surface.