2 tbsp (25 g) 1 oz butter
2 tablespoons oil
4 oz (100 g) streaky bacon rashers, rinded and diced
1 lb (450 g) leeks, chopped
5 celery stalks, thinly sliced
350 g (12 oz) carrots, thinly sliced
350 g (12 oz) courgette (zucchini)s, thinly sliced
1 large Spanish onion, chopped
1 garlic clove, crushed
1.75 litres (3 pints) chicken stock
salt and pepper
1 1/2 tablespoons tomato puree (paste)
4 tablespoons chopped parsley