- Combine the rice vinegar, sugar, chilli and garlic in a small saucepan.
- Bring to the boil, stirring, then simmer for 2 minutes. Allow to cool.
- Add the fish sauce and lime juice.
- Place the sliced cucumber and mango in a bowl. Add the cooled dressing liquid and toss gently.
- Set aside for 30 minutes before serving.
- Garnish with crushed peanuts and coriander leaves.