Start by making the salad. Place the cucumber, carrot, radish, tomatoes, onion and chilli in a large bowl.
Sprinkle with the sugar, pepper and salt and gently toss the salad until all the ingredients are uniformly mixed. Sprinkle with the lime juice and mustard oil, and crushed peanuts if using.
Cover and chill for 30 minutes, tossing the coriander through just before serving.</