Big-batch Bolognese

INGREDIENTS

• 4 tbsp olive oil
• 6 smoked bacon rashers, chopped
• 4 onions , finely chopped
• 3 carrots , finely chopped
• 4 celery sticks, finely chopped
• 8 garlic cloves , crushed
• 2 tbsp dried mixed herbs
• 2 bay leaves
• 500g mushrooms , sliced
• 1½kg lean minced beef (or use half beef, half pork mince)
• 6 x 400g cans chopped tomatoes
• 6 tbsp tomato purée
• large glass red wine (optional)
• 4 tbsp red wine vinegar
• 1 tbsp sugar
• Parmesan , to serve