Jamie's Christmas turkey

INGREDIENTS

• 1 large handful breadcrumbs
• 5 kg turkey, preferably free-range or organic
• olive oil
• sea salt
• freshly ground black pepper
• 1 clementine, halved
• a few sprigs fresh rosemary
• 2 onions, peeled and roughly chopped
• 2 sticks celery, roughly chopped
• 2 carrots, roughly chopped
• 2 onions, peeled and finely chopped
• ½ teaspoon ground nutmeg
• a few sprigs fresh sage, leaves picked and roughly chopped
• 300 g higher-welfare pork mince