01 -
Boil elbow macaroni in a large pot of salted water according to package directions until al dente. Drain well and rinse with cold water to halt the cooking process. Transfer pasta to a large mixing bowl.
02 -
Add shredded carrot, shredded onion, and apple cider vinegar to the cooled macaroni. Toss thoroughly to distribute the vegetables and vinegar, then cover and refrigerate for 15 minutes.
03 -
In a separate bowl, whisk together mayonnaise, milk, sugar, salt, and black pepper until smooth and fully combined.
04 -
Pour the dressing over the chilled pasta mixture. Fold gently to coat the macaroni evenly. Cover and refrigerate for at least 1 hour to allow flavors to meld.
05 -
Stir the macaroni salad once more before serving. Serve cold as a side dish.