Place the eggs in enough cold water to cover in a large saucepan with a lid. Bring to a boil over mediun-high heat. Immediately remove from heat, cover, and leave for 10 minutes. Drain off the hot water, and run the eggs under cold water until cool. Tap the eggs gently in several places to crack and then peel. (for easy peeling, place the cool egg in a pan of cold water for 10 minutes before cracking.)
Slice the eggs in half lengthwise. Carefully remove the yolks from the whites, and place the yolks in a bowl. Add the salad dressing, mustard, lemon juice, salt and pepper. Using a fork, mix until well blended.
Refill the egg white halves with the yolk mixture, using a spoon or small spatula. Garnish with parsley leaves and chill thoroughly before serving.
FOR DEVILED EGGS RANCHERO: In a bowl, combine the yolks with 1/2 cup mayonnaise, 1/4 drained chunky hot salsa, 1/4 cup finely shredded Monterey Jack pepper or sharp Cheddar cheese, 2 Tbps. finely chopped fresh cilantro and salt and ground black pepper to taste. Refill the egg whites. Garnish each with a dolop of guacamole and a sprinkling of finely minced fresh chives.
FOR DEVILED CAVIAR EGGS: For this adult version, in a bowl, combine the yolks with 1/4 cup mayonnaise, 1 teaspoons Dijon mustard, 2 teaspoons fresh lemon juice, 1 tablespoons finely minced fresh parsley, 2 tsp, minced fresh chives, 1/8 teaspoons hot pepper sauce, and 2 oz. caviar. Mix until blended. Season to taste with salt and ground black pepper. Refill the egg whites. Garnish each with a tiny dollop of sour cream and a dab of caviar, serve with champagne.