handful fresh basil, shredded (optional)
1 carrot, peeled and diced finely
1 celery stick, finely chopped
1 garlic clove, crushed
2 onions, chopped
450g/1lb fresh ripe tomatoes, halved
salt and freshly ground black pepper
2 tbsp olive oil
1 tsp sugar
1 litre/1戮 pints vegetable stock