Cook potatoes in salted water. Peel and still warm Strain. Leave to cool. During this time the onion Chop and sauté with the oil. Add the chopped ham and lightly fry. To cool potatoes add eggs, crumbled feta cheese, flour, parsley and pepper. It is well kneaded. Shape is bigger balls and make holes each to make nests. Each hole is placed on ham mixture and sprinkle with grated cheese. Arrange in a greased tray. Bake in preheated oven at 220 C until golden - about 20 minutes. When you are ready to decorate with a sprig of parsley.