bunch fresh basil
1 lemon, juice only
mirepoix (finely chopped vegetables) such as 1 onion, 1 celery stalk, 1 carrot, 1 clove of garlic
200g/7oz penne pasta
1 tbsp plain flour
1 bay leaf
2 tbsp olive oil
½ pint fish stock (shop bought)
1 tbsp tomato purée
3 tbsp crème fraîche
good handful parmesan
255g/8oz cooked peeled prawns
½ glass white wine