1. Heat the grill to high. Peel and dice the mango, toss with most of the spring onions, and the cumin and rice vinegar, then set aside. Put the couscous in a large heatproof bowl, pour over 400ml boiling water, then cover with cling film and set aside.
2. Mix together the marmalade and mustard. Lay the chicken strips in a roasting tin, then brush over half of the marmalade glaze. Grill for 4-5 mins, then turn the chicken over and brush with the remaining glaze. Grill for a further 4-5 mins until the chicken is cooked through and the glaze is bubbling. The couscous should then be ready. Stir in the mango mixture and serve with the hot chicken.