In a large pot, bring water to boil. Add 2 tsp salt. Add diced potatoes, after 2-3 minutes, add macaroni and cook based on package instructions n(typically 6-8 minutes). When done, drain water and set macaroni and potatoes aside
In a small mixing bowl, bring together all ingredients for dressing - mayo, apple cider vinegar, sugar and salt.
In a large mixing bowl, bring together cooked potatoes and macaroni, along with chopped shredded carrots and shredded sweet onions.
Pour dressing all over potato and macaroni mixture. Gently fold to combine salad.
Refrigerate for at least 5 hours, or up to 24 hours.
Serve cold and enjoy!