Gennaro's stuffed porchetta

INGREDIENTS

• 3 kg boned higher-welfare shoulder of pork, butterflied and skin on
• sea salt
• freshly ground black pepper
• 2 onions, peeled and finely diced
• olive oil
• 200 g higher-welfare chicken livers, cleaned and roughly chopped
• 200 g higher-welfare pork mince
• 75 g pine nuts
• 100 g raisins
• ½ bunch fresh sage, leaves picked and roughly chopped
• ½ bunch fresh flat-leaf parsley, leaves picked and roughly chopped
• 1 wineglass red wine or mulled wine, plus a bit extra for the stuffing
• 8 carrots