Combine the diced apples, halved grapes, sliced celery, and toasted walnuts in a large bowl.
Whisk together the mayonnaise, lemon juice, honey (if using), salt, and pepper in a separate small bowl.
Pour the dressing over the apple mixture and toss until all ingredients are well-coated.
Adjust seasoning to taste, adding more lemon juice or salt if needed.
Chill the salad for about 15-20 minutes before serving to allow the flavors to meld.
Notes
This salad offers a crisp, creamy bite with just the right amount of crunch and sweetness—a perfect, refreshing side for holiday meals or any occasion.