Step 1

Boil the macaroni in lightly salted water and cook to al dente (1 minute less than package instructions).

Step 2

Make the sauce by combining the mayonnaise, vinegar, milk, sugar, salt, and pepper in a large mixing bowl.

Step 3

Drain the macaroni and rinse with cold water, then drain that as well.

Step 4

Add the macaroni, celery, shredded carrot, and grated onion to the large bowl with the sauce and gently mix to combine.

Step 5

Cover and refrigerate the salad for at least 4 hours. Gently mix before serving.