Celery Root and Apple Salad - Well Seasoned

Ingredients

• 2 teaspoons Dijon mustard
• 2 Tablespoon apple cider vinegar
• 4 Tablespoons extra-virgin olive oil
• Sea salt and freshly ground pepper to taste
• 1 medium celery root
• 1 medium tart apple (like granny smith or fuji)
• 4 medium celery stalks
• 2 Tablespoons freshly squeezed lemon juice (about ½ a large lemon)
• 2 Tablespoons, fresh celery leaves, finely chopped
• ¼ cup fresh flat leaf parsley, finely chopped
• ¼ cup toasted walnuts