1Toss together the Red Delicious apples, Granny Smith apples, celery, raisins, and walnuts in a large bowl; set aside. In a small bowl, whisk together the walnut oil, cider vinegar, salt, and pepper. Toss the apples with the dressing to serve.
To toast nuts:
Preheat the oven to 350 degrees F (175 degrees C) and spread the walnuts out on a baking sheet. Bake for 10 minutes or until fragrant.