In a food processor, shred 4-6 cups cabbage and 1 large carrot. Place in a medium bowl.
Using a glass measuring cup, stir together 1 cup whipped salad dressing, 3 tablespoons apple cider vinegar, 3 tablespoons granulated sugar, 2 tablespoons vegetable oil, 1 tablespoon dried minced onion, and 1 teaspoon celery seed. Whisk until well blended.
Pour dressing over shredded cabbage mixture. Mix well. Refrigerate for several hours or overnight. Serves 8-10