Another of the recipes from my sister, who went on a cooking class in Thailand. If you can't find galangal you can substitute ginger, for the coriander root you can substitute the stems.
Soak dried chillis in hot water for 15 minutes.
While the chillis are soaking, put garlic, galangal, lemongrass, lime peel & coriander root into a mortar (or electric grinder) & pound well.
Put shallot, red chillies & shrimp paste into mortar & pound until smooth (and there are no lumps).
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