1 3/4 pounds Whole bone-in, skin-on split chicken breast halves
Kosher salt
Freshly ground black pepper
2 Whole lemons
1 clove Medium garlic, minced
1/2 cup Finely diced celery
1/2 cup Finely diced red onion
1 tablespoon Minced fresh chives
1 tablespoon Minced fresh parsley leaves
1 tablespoon Dijon mustard
1/4 cup Mayonnaise
1 tablespoon Minced fresh tarragon leaves, divided
4 sprigs Tarragon