Mix all the ingredients well.
Toast the peanuts in an uncoated frying pan without any oil, remove and set aside. Heat the oil in the same pan. Fry the lamb loins for approx. 3 mins. on each side over a medium heat, remove, season and cut into slices approx. 1 cm thick.
Combine the lettuce and mango with the dressing and arrange on plates. Place the lamb on top and sprinkle with the reserved nuts and coriander.