Martha Stewart's Upside-Down Thanksgiving Turkey

Ingredients

• Kosher salt and freshly ground pepper
• 1 whole turkey (14 pounds), patted dry
• 1 loaf ciabatta bread (1 pound)
• 1 stick unsalted butter, room temperature
• 2 cups low-sodium chicken broth
• Halved fresh figs, red, black, and green grapes; and sage and thyme sprigs, for serving