This salad goes beyond potatoes and lightens up the traditional mayo-based dressing with the tangy flavors of buttermilk and dill. Potato salads are a great way to use up leftover cooked, roasted and grilled vegetables. Up the ante and make it fully loaded with leftover cooked bacon or other proteins. Just because it says potato salad doesn’t mean you can’t customize it with food items that need to be used up.