Duck pancakes with hoisin sauce

Name: Duck pancakes with hoisin sauce
Ingredients: 4 duck breasts, about 175g/6oz each, skin removed; ½ tsp chinese five spice; Freshly ground black pepper; 2 tbsp sesame oil; 100ml/3½fl oz hoisin sauce; 8-10 ready-made chinese-style pancakes (or mini flour torillas), warmed; 1 bunch spring onions, cut into matchsticks; ½ cucumber, halved, seeds removed and cut into matchsticks