5 medium white potatoes, unpeeled 2 eggs, beaten 1 teaspoon cornstarch 3/4 cups white sugar 1/2 teaspoon salt 1/3 cup apple cider vinegar 1/2 cup milk 1 teaspoon yellow mustard 3 tablespoons butter 1 cup mayonnaise or salad dressing 1 small onion, finely chopped 1 cup chopped celery 1 cup chopped carrots 1 teaspoon celery…