Cook the bacon in a medium skillet over medium heat, stirring occasionally, until golden brown and crisp, about 8 minutes; drain on paper towels.
Whisk the mayonnaise, vinegar, mustard, sugar and celery seeds in a large bowl until combined. Slice the apples into matchsticks, then add to the bowl with the dressing along with the celery, carrots, walnuts, raisins, parsley and bacon. Season with salt and pepper and toss.
Photograph by Con Poulos
Courtesy of Food Network Magazine