Heat the oil in a large pan, sauté the beans and potatoes for approx. 2 mins. Add the bouillon, cover and simmer over a low heat for approx. 20 mins. Season. Heat the oil in a non-stick pan, sauté the tofu and onions over a medium heat for approx. 5 mins., then remove and season. Serve the potatoes and beans with the tofu, with a sprinkling of mixed seeds and chervil.