Celery, Apple and Fennel Salad

This salad is a really refreshing summer side dish.  It is especially nice paired with grilled fish or barbequed chicken.

Ingredients:
3 tablespoons extra-virgin olive oil
2 1/2 tablespoons apple cider vinegar
1 1/2 tablespoons coarsely chopped fresh tarragon
2 teaspoons fresh lemon juice
1/4 teaspoon sugar
3 celery stalks, chopped
2 small fennel bulbs, thinly sliced crosswise, plus 1 tablespoon chopped fennel fronds
1 firm, crisp apple (such as Pink Lady, Gala, or Granny Smith), sliced
Kosher salt and freshly ground black pepper

Directions:
Whisk first 5 ingredients in a medium bowl. Add celery and celery leaves, thinly sliced fennel and chopped fennel fronds, and apple; toss to coat. Season to taste with salt and pepper.