Defrost the beans. Peel and slice the onion. Clean and wash the celery and cut into thin slices. Peel and wash the potatoes and cut them into halves or quarters depending on their size. Peel and chop carrots, parsnips and parsley roots. Peel and roughly dice turnip and celeriac. Peel garlic and chop coarsely
Heat oil and butter in a roasting pan. Fry onion, garlic and celery for about 4 minutes. Add prepared vegetables and mix everything together. Stew in a closed roaster for about 5 minutes. Season with cumin, coriander and chilli. Add the stock, bring to the boil and simmer for about 15 minutes
Press the beans out of the skin, add them to the stew and cook for another 5 minutes. Season to taste with salt and chilli. Serve with sour cream and bread
Waiting time approx. 20 minutes