Add the sliced apple, fennel, celery, raisins and nuts to a large bowl and toss to combine.
In a small bowl or pyrex, combine the dressing ingredients: apple cider vinegar, honey, lemon juice, salt and pepper and whisk until the honey dissolves and becomes a smooth dressing. Pour over apple mixture and toss to coat well.
Eat right away or store in fridge for up to 5 days!