Clean and wash the salad, pluck into bite-sized pieces and drain. Wash chicken fillets, dab dry, season with salt and pepper. Heat 1 tablespoon of oil in a frying pan and fry the chicken fillets for 6-8 minutes, turning them over. In the meantime season the vinegar with salt, pepper and sugar. Fold in the remaining oil. Coarsely crumble the blue cheese and add to the vinaigrette.
Cut out medium-sized balls from the melon with a ball cutter. Mix salad with melon balls and vinaigrette. Arrange on a plate. Cut the chicken fillets into slices about 1 cm thick and arrange on the salad. Coarsely chop the walnuts and sprinkle them on the salad