Combine the lime with all the other ingredients up to and including the chilli. Coat the prawns with 2 tbsp of the marinade, cover and marinate in the fridge for approx. 1 hr. Set aside the remainder of the marinade.
Heat the oil in a non-stick frying pan. Fry the prawns for approx. 2 mins., then remove from the pan.
Place a sheet of rice paper in warm water for approx. 30 secs. then lay on a damp cloth.
Place 4 prawns, a little mint, 1 slice of mango, several strips of cucumber and 1 baby lettuce leaf in the centre of each sheet of rice paper. Drizzle over a little of the remaining marinade. Fold the edges inwards, then roll up from the bottom, place on a plate, and cover with a damp cloth. Repeat the process with the remaining rice sheets and ingredients.