½ cucumber, halved, seeds removed and cut into matchsticks, to serve
1 bunch spring onions, cut into matchsticks, to serve
100ml/3½fl oz hoisin sauce
freshly ground black pepper
2 tbsp sesame oil
½ tsp Chinese five-spice powder
4 duck breasts, about 175g/6oz each, skin removed
8–10 ready-made Chinese-style pancakes (or mini flour tortillas), warmed, to serve