01 -
Fill a large saucepan with water, add 2 tablespoons of salt, and bring to a rolling boil. Add elbow pasta and cook according to package instructions until al dente. Drain thoroughly.
02 -
Meanwhile, peel the hard-boiled eggs and lightly mash or chop them into small pieces in a bowl.
03 -
Peel and roughly chop the onion. Use a food processor or the fine side of a box grater to grate it finely.
04 -
In a mixing bowl, blend mayonnaise, mustard, salt, and white pepper until smooth and uniform.
05 -
Transfer the drained hot pasta into a large bowl. Add unsalted butter and stir until fully melted and pasta is coated.
06 -
Add the mayonnaise dressing, grated onion, and olive oil to the warm pasta. Mix thoroughly to combine.
07 -
Gently fold in the chopped eggs until evenly distributed throughout the salad.
08 -
Cover and refrigerate for at least 4 hours to allow the flavors to develop. Serve chilled.