Prepare the pasta. While it’s cooking, mix the mayonnaise, vinegar, sweetened condensed milk and sugar to make the sauce. Drain the pasta, mix in the sauce, add the vegetables. Chill overnight.
The sauce sounds like an odd combination of things that would not be good together, but trust me, it’s awesome. I really loathe traditional macaroni salads, so when my mother found this one, I was thrilled. And while you can serve this as soon as it’s chilled, it really tastes better if everything has had time to kind of mingle, so letting it chill overnight is best. A word of warning, this makes a LOT of pasta salad. This is best for a pot luck rather than dinner at home, unless you have a lot of people coming over.