To humanely kill the mud crab, place them in the freezer for 30-40 minutes until you see no movement at all, if they do twitch at all, put them back in the freezer until fully asleep, then immediately transfer from freezer to cooker and  plunge them quickly into a large pot of boiling water. This is the most stress-free way. Never put them into simmering water; it must be boiling, this method is the most cruel-free manner.

* Mud and blue swimmer crabs are from fishmongers. Tamarind concentrate and chilli garlic sauce are from Asian food shops. Galangal is from greengrocers and Asian food shops.

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