In a saucepan combine the chicken with the scallion, ginger and salt to taste. Add enough of the chicken broth to just cover. Bring the liquid to a boil over moderate heat and simmer, covered, for 8 to 10 minutes, or until chicken is just cooked through. Let cool in broth. Drain and cut into strips.
Make the dressing: In a food processor or blender combine ingredients and process until combined well.
In a bowl combine the chicken with the scallion, carrot, snow peas, basil, mint and cilantro. Add the dressing and toss to combine.
In a deep fat fryer heat the oil until hot. Add the rice noodles and cook until crisp. Transfer to paper towels to drain. Arrange rice noodles on serving plate and top with the chicken salad.