Spatchcock Turkey With Anise and Orange

Name: Spatchcock Turkey With Anise and Orange
Ingredients: 5 tsp. aniseed; ½ cup kosher salt; ¼ cup finely grated orange zest, plus 4 wide strips orange zest; 2 Tbsp. dark brown sugar; 1 Tbsp. coarsely chopped fresh rosemary, sprig reserved; 1 Tbsp. fresh thyme leaves, sprigs reserved; 2 tsp. freshly ground black pepper; 1 12–14-lb. turkey (neck, giblets, and backbone removed and reserved); 2 medium onions, quartered; 4 large carrots, peeled, halved; 4 celery stalks; 3 heads garlic, halved; ½ cup olive oil