Cook the pasta. Make the pasta until very soft, 12-14 minutes.
Make the dressing. Combine all the mayo, milk, apple cider vinegar, and sugar in a small bowl, then whisk until everything is incorporated. Add in the grated onions and carrots, then stir until mixed. Season with salt and pepper to taste.
Combine the dressing and pasta. Pour the dressing onto your macaroni noodles, then gently stir with a wooden spoon until everything is incorporated.
Chill, serve, and enjoy. Place your mixed salad in the refrigerator to cool for an hour or 2. Serve your Mac Salad with some Kalua pork or grilled pineapple, and enjoy.
