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1
Set a wide, heavy pan over medium heat and add the coconut oil. When the oil is fluid and faintly fragrant — not smoking — add the sliced onion, garlic, split green chilli, and curry leaves. Cook, stirring regularly, until the onion is completely soft and translucent but has taken on no colour whatsoever, because the moment the onion browns it introduces a caramel bitterness that will read through every spoonful of the finished sauce — the pan should smell of warm coconut and raw allium, nothing more.
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2
Add the grated fresh turmeric and stir it through for thirty seconds, until the onion mass is evenly coloured pale gold. Pour in all of the thin coconut milk and season with salt, then raise the heat to bring the liquid to a steady, open simmer. Maintain this simmer for six to eight minutes, until the base has reduced very slightly and smells rounded and faintly sweet rather than sharp, so the raw coconut flavour has cooked off and the sauce will carry the prawns cleanly instead of tasting of the tin.
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3
Add the prawns to the simmering thin-milk base — they must not go in before the base is fully developed, or they will overcook before the sauce is ready to receive them. Cook for three to four minutes only, turning each prawn once. This is where the dish lives or dies: pull the pan from the heat the moment the prawns are just opaque through to the centre and have curled into a loose C, because any further and the texture collapses beyond recovery.
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4
Remove the pan from the heat entirely, then pour the thick coconut milk in a slow, steady stream over the prawns, stirring gently to incorporate, so the residual heat of the sauce warms and tempers the thick milk gradually rather than shocking it into splitting. The sauce must not return to the boil at any point after this addition — tilt the pan and observe the surface; it should be still and creamy, not bubbling, because a boil will break the emulsion into oil and white curds and the dish cannot be recovered.
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5
Taste for salt, adjust, and serve immediately with appam, idiyappam, or basmati. The finished moilee should be pale gold, glossy, and fluid — not thick, not broken, not stained with brown.