Tom yum (hot & sour) soup with prawns

1. step 1
2. Bring the stock to a boil in a medium-sized saucepan. Add the lemongrass, galangal, coriander roots and lime leaves, then simmer for 2 mins.
   2 minutes
3. step 2
4. Add the prawns, fish sauce, chillies and lime juice, then return to the boil. Taste and adjust the seasoning with either more lime juice or fish sauce, then garnish with coriander leaves and serve.

Cooking notes

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When you scale this recipe up or down, remember that cooking time does not scale linearly. A doubled cake takes longer, but not twice as long; a doubled soup takes roughly twice as long. The cooking-time guide gives sensible starting estimates by dish geometry.