This easy Hawaiian macaroni salad is a creamy, simple side dish made with macaroni, shredded carrots, and onion, dressed with a slightly sweet, tangy dressing. The dressing may look thin at first, but after chilling, the pasta absorbs the excess liquid, leaving the salad perfectly thick and creamy. It is a great make-ahead side for cookouts, luau parties, and summer meals.
Cook macaroni according to package directions. Pour into a colander and rinse with cold water. Allow to drain well and cool for 15 minutes.
In a bowl, whisk together mayo, milk, vinegar, and sugar. Add the macaroni, carrots, and onion to the mayo mixture and fold together until evenly coated. Add salt and pepper to taste.
Cover and refrigerate for at least 4 hours (best if overnight). Gently stir before serving, adding a little more milk if needed to thin, but no more than a tablespoon or two.