Celeriac Slaw

Ingredients

• 1 celery root, no larger than a softball
• 1 small cabbage, red or green
• 4 Granny Smith apples
• Dressing:
• ½ cup plain yogurt
• ½ cup mayonnaise
• ¼ cup olive oil
• 2 tablespoons Dijon mustard, more to taste
• 1 tablespoon grated fresh ginger
• 2 tablespoons apple cider vinegar
• 1 tablespoon sugar
• salt and pepper to taste