Prawn turmeric and coconut soup

Combine stock and coconut milk in a large saucepan, add sugar and salt and bring to the boil. Place coriander roots, lemongrass, turmeric, garlic and chilli flakes in a food processor and whiz until finely chopped or crush in a mortar and pestle. Add mixture to hot stock and simmer for 5 minutes. Add prawns and simmer until prawns just change colour. Add coconut cream, fish sauce and lime juice and stir.

To serve 

Ladle soup into warm bowls and top with coriander leaves.