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Heat a dry frying pan and add the coriander and cumin seeds, mace and nutmeg. Roast until they begin to colour and release their aromas. Remove from the heat, then grind to a powder in a spice mill or blender.
Put the garlic in a blender or pound using a pestle and mortar, then add the shallots, coriander roots, chillies, galangal, lemongrass and 2 tsp salt. Finally, add the lime leaves, shrimp paste, basil and the ground spices, then whizz or pound until you have a smooth paste.
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