Twice-cooked belly pork

Ingredients

• 2kg whole piece of pork belly – skin removed, bones left in
• 400g onions – thickly sliced
• 400g carrots – roughly chopped
• 5 celery sticks – roughly chopped
• 1L brown beef stock
• 500ml white wine
• 3 bay leaves
• 4 cloves
• Salt and black pepper