Begin by whisking together the mayonnaise, sugar, lemon juice, and salt in a serving bowl. This will create a creamy, tangy dressing that is the perfect complement to the fresh ingredients.
Next, add in the diced apples, thinly sliced celery, chopped walnuts, and plump raisins of grapes (if using). Mix everything together well to ensure that the dressing coats each ingredient, providing a delicious burst of flavor in every bite.
Once everything is combined, cover the bowl and let the salad chill in the refrigerator until you're ready to serve. The cool, refreshing flavors of this Waldorf Salad will be a hit at any meal, whether it's a quick lunch or a fancy dinner party. For an extra boost of protein, try adding some diced, roasted chicken to transform this dish into a hearty, satisfying meal. Enjoy!