Chunky minestrone soup

INGREDIENTS

• 3 large carrots , roughly chopped
• 1 large onion , roughly chopped
• 4 celery sticks, roughly chopped
• 1 tbsp olive oil
• 2 garlic cloves , crushed
• 2 large potatoes , cut into small dice
• 2 tbsp tomato purée
• 2l vegetable stock
• 400g can chopped tomatoes
• 400g can butter or cannellini beans
• 140g spaghetti , snapped into short lengths
• 1⁄2 head Savoy cabbage , shredded
• crusty bread , to serve