Bring a large pot of water to a rapid boil and salt generously.
Cook the macaroni until firm.
let the macaroni cool for 20 minutes.
In a large bowl, combine the mayo, milk, vinegar, grated onion, green chilies, salt, and pepper.
Fold in the macaroni, pineapple, carrots, peas, and finely chopped boiled eggs.
Season generously with salt and pepper.
Garnish with scallions and enjoy!