Homemade minestrone

INGREDIENTS

• 2 tbsp olive oil
• 1 large onion
• 150g/5½oz streaky bacon
• 4 celery
• 2 garlic
• 2 carrots
• 2 potatoes, peeled, diced
• 1 litre/1 pint 15¼fl oz beef stock
• 30g/1oz tomato purée
• 400g/14 oz canned haricot beans
• 1 bay leaf
• 1 tsp fresh thyme
• handful chopped fresh parsley
• 400g/14 oz tomatoes, chopped
• 100g/3½ oz spaghetti
• salt and freshly ground black pepper
• 1 crusty white bread
• 1 tbsp olive oil
• 200g/7oz mozzarella