Thai coconut chicken soup recipe

1tsp vegetable oil
1-2tbsp green curry paste
700ml (23fl oz) chicken stock
165ml (5½fl oz) coconut milk
¼tsp sugar
1 x 400g (14oz) pack mini chicken fillets, thinly sliced
1 x 125g (4oz) shitake mushrooms, quartered
150g (5oz) sugar snap peas, trimmed
1 lime, juiced and zested
2 spring onions, trimmed and sliced
beansprouts, to serve
coriander leaves, to serve

Heat the oil in a large heavy-based saucepan then add the curry paste. Cook, stirring, for about 30 seconds. Pour in the stock and the coconut milk, then stir in the sugar and let it simmer for 5 minutes. Add the chicken fillets and cook for a further 5 minutes. Toss in the mushrooms and cook for 3 minutes, then add the sugar snaps. Simmer for a few minutes more, until the chicken is cooked through, with no pink showing and the vegetables are just tender. Squeeze in the lime juice, then ladle the soup into bowls and top with spring onions, beansprouts, coriander leaves and a little lime zest.