1.Combine mayonnaise, juice and wasabi in a small bowl. Combine cucumber, capsicum, chestnuts, onion, sprouts, herbs and sauce in medium bowl.
2.Combine prawns, chilli and garlic in medium bowl; season. Cook prawns in heated large non-stick frying pan over medium heat until changed in colour.
3.Serve prawns with wasabi mayonnaise and sprout salad.
This salad is at its best served straight after cooking the prawns.