1Bring a large pot of lightly salted water to a boil. Cook elbow macaroni in the boiling water, stirring occasionally, until cooked through but firm to the bite, 8 minutes; drain.
2Rinse macaroni in cold water until cool; drain.
3Stir mayonnaise, onion, parsley, mustard, rice vinegar, sugar, celery seed, and salt together in a bowl; add macaroni and eggs and stir to coat.
4Chill in refrigerate for 30 minutes before serving.
Footnotes
Tip
Aluminum foil helps keep food moist, ensures it cooks evenly, keeps leftovers fresh, and makes clean-up easy.