Hard boil the eggs and let them cool. Peel them and slice each one in half lengthwise. Remove the yolks and place them in a bowl. Mash the yolks with a fork and add the next four ingredients. Season with salt and pepper, and make sure all the ingredients are thoroughly mixed. Use a melon baller or small spoon to gently fill the egg halves with the yolk mixture. Garnish with parsley and serve.