- Place eggs in a medium saucepan and cover with cold water. Bring to a rolling boil over high heat. Once boiling, remove from heat, cover, and let sit for 10 minutes. Then, transfer eggs to a bowl of ice water to stop cooking and facilitate peeling. 
- Peel the cooled eggs carefully, then cut each egg in half lengthwise with a sharp knife. Gently remove the yolks and transfer them to a mixing bowl. Arrange the halved egg whites on a serving platter. 
- Mash the yolks with a fork until smooth, then add mayonnaise, mustard, vinegar or lemon juice, salt, and pepper. Mix thoroughly until the mixture is creamy and well combined. Adjust seasonings to taste. - 6 large eggs 
- Use a spoon or piping bag to carefully fill each egg white half with the yolk mixture, mounding slightly for presentation. Ensure each half is evenly filled and tidy. 
- Sprinkle the filled eggs with paprika or chopped chives for garnish. Serve immediately or refrigerate for up to 2 hours before serving. - 6 large eggs