“Autumn Picnic” Dinner Party — Les Petites Gourmettes

Ingredients

• 1/2 cup prepared mayonnaise
• 1 tablespoon minced fresh tarragon
• Zest of 1 large lemon
• 1/2 teaspoon salt
• 2 tablespoons peeled and freshly grated horseradish
• 2 tablespoons fresh-squeezed lemon juice
• 1 pound (about 2 bulbs) celery root, peeled and cut into bite-size matchsticks
• 2 large apples, cored and cut into bite-size matchsticks