Heat the oil in a 35cm/14in lidded, flameproof casserole dish, on a medium heat. Add the onions and salt and fry until they're light golden brown, around 20 minutes. Adding the salt at this stage ...

First, make the lentil ragu. Heat the oil in a deep ovenproof pan over a medium heat. Add the celery, carrot, onion, garlic and dried herbs to the pan and fry for 5–6 minutes, until the ...