In a bowl, combine the prawns, 1 teaspoon sesame oil, lime leaves and chillies. Put aside.
Steam green beans for 3 minutes, remaining vegetables for 2 minutes. Plunge into cold water. Drain when cool.
Soak noodles in boiling water until soft and transparent - approximately 2-3 minutes. Drain well.
Pour a little sesame oil into a hot wok and stir fry prawns in batches until opaque (approximately 2-3 minutes). Put aside and allow to cool.
Place all sauce ingredients into a bowl and mix.
Toss all ingredients together well and serve cold.
Tip: Bean thread noodles are long and difficult to combine with other ingredients. To make them more manageable, cut them down in size using scissors ( to approx 10cm pieces) and use your hands to incorporate the other ingredients through them.