Traditional remoulade is made with mayonnaise. We have lightened this traditional side dish with a lemony-yogurt dressing.
Peel celery root; core apple. Grate both on the large holes of a box grater. Place in a medium bowl, and toss with lemon juice to prevent discoloration.
In another bowl, whisk together yogurt, cream, mustard, salt, and pepper. Add to grated celery root and apple, and toss to combine. Refrigerate until ready to serve.