Bring milk, 1/4 litre water, butter and salt to the boil. Stir in polenta semolina and simmer at low heat for about 30 minutes while stirring. Spread on a plate about 2 cm thick and let cool down
Cook the beans in boiling, slightly salted water for 10-12 minutes. Peel and finely dice the onion and fry it in 1 tablespoon of oil in a small pan. Clean the mushrooms, cut them into leaves and fry them for about 5 minutes, turning. Pour on 1/8 litre vegetable-yeast stock. Season to taste with vinegar, herbal salt and pepper. Drain the beans and add to the mushroom vegetables. Cut tomatoes into quarters, remove seeds, dice flesh finely
Cut the polenta into triangles. Fry the rest of the oil in a coated pan until golden brown while turning. Serve with the vegetables in portions. Sprinkle with tomato cubes. Add 1 dash of crème fraîche to the polenta as desired. Serve garnished with parsley