Finely chop the chilli and make the dressing by combining all the ingredients.
Cook the spaghetti according to pack instructions. 3 minutes before it is cooked add the mangetout cut into thin strips and then drain into a colander.
Meanwhile, fry the prawns with a drizzle of oil for 2 minutes until warm.
Place the spaghetti into a large serving bowl. Add the prawns, cucumber (cut into strips) and shredded spring onions, drizzle over the dressing and mix together well.
Serve immediately, with coriander.