Method

• 1 Thickly slice the lamb and place in a bowl with the harissa paste and 1 tsp of the olive oil, toss well until the lamb is coated. Cover and leave to marinate in the fridge for 2-3 hours. Soak 6 bamboo skewers in water for at least 30 mins.
  
  2 Place the couscous in a large bowl, add the orange zest and juice, oil and 450ml/3/4pt of boiling water from the kettle. Season, then stir in the watercress. Cover the bowl with a plate and leave to soak for 15mins until the liquid has been absorbed. Fluff up the grains with a fork.
  
  3 Cut the pepper into wedges and toss in the remaining oil. Thread the pepper and marinated lamb onto the soaked skewers. Cook the kebabs over hot barbecue coals or under a hot grill for 10-15mins, turning occasionally until chargrilled on the outside, but still slightly pink on the inside. Serve the kebabs with the couscous and wedges of orange if liked.