Serves 8 Ingredients 1 tablespoon butter 2 tablespoons olive oil 3 cloves garlic, chopped fine 1 medium leek, sliced thin 1 medium red onion, chopped small 2 small or 1 medium celery root (2-3 pounds total), peeled and cubed small 1 medium apple, peeled, cored and chopped Salt Cracked black pepper ¼ cup apple cider…