01 -
Boil elbow macaroni in a large pot of salted water according to package instructions until al dente, approximately 8–10 minutes.
02 -
Drain the macaroni and rinse thoroughly under cold running water to halt cooking and cool completely.
03 -
In a large mixing bowl, whisk together mayonnaise, yellow mustard, vinegar, salt, and black pepper until smooth and emulsified.
04 -
Gently fold chopped hard-boiled eggs, diced celery, and red onion into the dressing until evenly coated.
05 -
Incorporate the cooled macaroni into the egg and vegetable mixture, stirring carefully to ensure uniform distribution and coverage.
06 -
Taste and adjust seasoning with additional salt and black pepper if necessary.
07 -
Cover the salad and refrigerate for at least 1 hour to allow flavors to meld before serving.