Preheat oven to 450°. Check for packaged innards; remove them. Rinse the inside & outside of the chicken with cold water. Pat dry. Sprinkle generously with salt and store uncovered in the refrigerator for 2-3 hours or overnight.
Cook for 35 minutes. Pour in the apple cider and cook for another 10 minutes. Over medium heat, whisk cornstarch into the drippings. Keep whisking to prevent any lumps. Cut the chicken into pieces and top with fresh sage. Serve with apple cider gravy.