Deseed melons. Cut out balls from the flesh with a ball cutter. Put melon balls and Parma ham on skewers. Pluck sage leaves from the stalks and cut into fine strips, except for a few leaves for garnishing.
Mix vinegar with salt, pepper and sugar. Whip the oil into it. Add sage strips and olives. Pour the vinaigrette over the skewers and leave to stand for a short time. Serve garnished with sage leaves.
Baguette tastes good with it.