To make the dressing for the noodles: whisk together all the ingredients until the sugar has dissolved. Then whisk in 4 tablespoons cold water and set aside.
Place the noodles in a large, heatproof bowl and cover with boiling water. Leave to soak for 15 minutes until soft. Drain, rinse well under cold water and drain again. Once cool and completely drained, toss the dressing through the noodles and set aside.
To make the spicy peanut dressing: in small bowl whisk together the peanut butter, garlic powder, ginger, crushed dried chillies, soy sauce, lime juice and vinegar. Stir in the water until thoroughly mixed. Set aside.
Arrange the noodles on a platter and scatter over all the salad ingredients, and gently toss to combine Serve with the peanut sauce.