Soak the noodles in boiling water for 3 minutes; drain and refresh briefly with cold water, shake dry and tip into a large bowl; add the sesame oil and stir well to coat completely
Mix the peanut butter, chilli sauce and lime juice together in a small bowl and loosen the dressing with 4 tablespoons boiled water to give a pouring consistency; stir about 2 tablespoons of the satay dressing into the prawns, then mix the rest with the noodles, carrot and spring onions, tossing to coat thoroughly
Divide the noodles between the lettuce leaves or tortillas then top with the mango, prawns and chopped peanuts, wrap the lettuce leaves or tortillas around the filling to eat
4 servings