Our test cooks discovered seasoning hot potatoes produced an extra flavorful potato salad. Now we share that secret with you. While developing other potato salad recipes, test kitchen cooks found that seasoning the potatoes while they're hot maximizes flavor. So as we developed our all-American potato salad recipe, we splashed hot russet potatoes with white vinegar and found them to be more flavorful than other types of potatoes treated the same way. Russets do crumble a bit when mixed, but tasters found this quality charming, not alarming. Just 1/2 cup of mayonnaise dressed 2 pounds of potatoes perfectly.