Trim and shred the cabbage; you can do this either by hand or with a food processor.
Peel and grate the carrots, and finely slice the celery and scallions.
Whisk together the mayonnaise, buttermilk, maple syrup and vinegar and coat the shredded vegetables with this dressing.
Season with salt and pepper and toss with the chopped nuts.
Recipe courtesy of Nigella Lawson(Copyright 2007, Nigella Express, Hyperion, All Rights Reserved)