Place the rice noodles in a bowl, pour over boiling water and leave to absorb for approx. 10 mins., drain.
Without adding any oil, toast the sesame seeds in a frying pan until golden brown. Mix the lime with all the other ingredients up to and including the hot chilli sauce, mix in the onion and half of the sesame seeds. Set aside 2 tbsp of the dressing.
Mix the rice noodles and dressing, serve in the bowls.
Wash the seaweed for approx. 5 mins. under running water, drain. Top the noodles with the seaweed and the remaining ingredients, drizzle with the reserved dressing. Sprinkle with the rest of the sesame seeds.