Cut the duck into 1cm wide strips and mix with the five spice. Heat the oil in a wok and, when hot, add the duck strips and stir fry for exactly 2 minutes until nicely browned but still a little pink in the centre.
Transfer to a large bowl and stir in the lime juice, fish sauce, soy sauce and clear honey. Set aside to cool to room temperature.
To serve place the salad leaves in a large serving bowl and toss with the mango, bean sprouts and duck with dressing. Scatter over the shredded onions, mint and sesame seeds and serve.