This is the old world way to enjoy this great vegetable.

Vinaigrette
1 tablespoon stone ground or Dijon mustard
2 tablespoons red wine vinegar
1 garlic clove, minced
1 tablespoon red onion, minced
Salt and Fresh Pepper
1/3 cup Olive oil
2 tablespoons sour cream

Add vinegar, garlic, onion and salt to a bowl and let sit for 15 minutes. Add remaining ingredients and whisk together.

Salad
1 celery root, thickly peeled and sliced into eighth-inch rounds and then cross-ways into matchsticks (julienned)
1 large tart apple peeled, cored, and sliced thinly

Bathe celery root in boiling water for 1 minute (start counting immediately, don’t wait for reboil. Remove and rinse with cold water. Dry thoroughly and toss with remaining ingredients and vinaigrette.