Crisp Apple-Scented Roast Turkey with Cider-Calvados Gravy

Ingredients

• Extra-virgin olive oil
• 1 (10–12-lb.) turkey
• 2 lb. mixed chicken legs and thighs
• 1 cup kosher salt, plus extra for seasoning
• 1⁄2 tsp. freshly ground black pepper, plus more for seasoning
• 5 yellow onions
• 39 cloves garlic
• 4 carrots
• 4 celery ribs with leaves
• 1⁄2 cup calvados (apple brandy), plus 4 teaspoons
• 6 1⁄2 cups dry white wine
• 1⁄3 cup packed cup dark brown sugar
• 1⁄3 cup ground ancho chile powder
• 8 1⁄3 cups fresh apple cider
• 6 granny smith apples
• 2 lightly packed cups fresh basil leaves, plus 8 leaves for garnish
• 4 tbsp. softened butter
• 1⁄4 cup flour