In a medium sized bowl, whisk together 6 tablespoons mayonnaise (or yogurt), 1 teaspoon honey, 1 tablespoon lemon zest, 1 tablespoon lemon juice, 1/2 teaspoon kosher salt, and 1/2 teaspoon black pepper.
In a large bowl, combine 2 apples(cored and chopped into cubes), 1 cup celery(thinly sliced), 1 cup green seedless grapes(quartered), and 1 cup walnuts(chopped).
Pour dressing over 6 leaves butter lettuce and gently toss to combine.
Serve on a bed of fresh butter lettuce.
Notes
The best apples are crisp, sweet, juicy apples like a Fuji, Jonagold, or Honeycrisp. I prefer to leave the skin on for extra color and flavor. Plain greek yogurt can be used in place of the mayonnaise, however you may need to add more honey to compensate for the tartness.