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Mix together the lime juice, chilli, fish sauce and sugar in a large bowl. Add the shallots and three quarters of the peanuts and mix well. Cover and set aside for up to 4 hours.
Peel and coarsely grate the mango or apple, and stir into the mixture along with the mint. Heat the oil in a frying pan or wok, add the prawns and stir fry quickly until evenly pink – about 2 minutes.
Scatter the lettuce leaves on a serving plate and spoon the salad mixture in the centre. Surround with the prawns and scatter over the remaining peanuts and spring onions.