Step 1

Warm the oil in a large pot. Add the ginger, turmeric, spring onions and chilli, cooking for 3 or 4 minutes.

Step 2

Add the zest, fish sauce, coconut cream, tomatoes and stock, bringing to a simmer for 8 minutes. This can be done ahead of time.

Step 3

Before serving, bring the liquid back to a simmer. Add the noodles and prawns, cooking for 4 or 5 minutes depending on their size. Add the bok choy, cook until wilted and tender.

Step 4

Stir through the coriander and serve with a squeeze of lime.