Cook macaroni past according to package directions. Rinse with cold water and drain once done.

While the pasta is cooking, carefully rinse and drain the grated yellow onion using a fine mesh strainer.

Mix mayonnaise, milk, rice vinegar and sugar in a small bowl.

In a large mixing bowl, add the cooled pasta, carrots, onion, and dressing and stir well to combine. Season with salt and white pepper to taste.

Refrigerate for one hour before serving.