1.In a large bowl put cucumber, iceberg lettuce, bean sprouts, yellow pepper, spring onions and herbs. Scatter with chilli. Cover and refrigerate until ready to serve.
2.Break the chicken apart into large chunks, discarding skin unless it is golden, and bones and sinews. Cut flesh into large bite-sized pieces. Add chicken to salad bowl.
3.Whisk lime juice, sugar, salt and fish sauce together. Pour dressing over salad and toss gently. Serve immediately.