Wash and dice the 6 apples into bite-size pieces. Place the diced apples in a large bowl and toss in lemon juice. Rinse and half 2 cups of grapes. Wash and slice the 3 ribs of celery to get 1 cup. Cut the walnuts in half.
Mix celery, grapes, and walnuts in with the apples. Add 3/4 cup mayonnaise or yogurt and stir until the fruit and nuts are well coated.
Refrigerate salad until ready to serve.
Serve over a bed of green leaf lettuce or mixed salad greens.
Video
Notes
Storing Leftovers:
Keep any leftovers in an airtight container in the fridge. It's best to use this salad within a day or two. The apples will start to brown, the pecans will soften, and the salad will become watery.