Put the onions, carrots, celery and turnip in a large ovenproof casserole dish. Pour in the stock and bring to the boil.
Add the leeks, kale and seasoning. Stir to mix the vegetables together. Cover and transfer to the oven to cook for about 1 hour until the vegetables are just soft, stirring halfway during.
Sprinkle with the parsley and serve with slices of crusty farmhouse bread.