Onions peel and chop finely. Heat the oil in a pot. Fry the onions and rice until translucent. Deglaze with stock and wine, bring to the boil, cover and cook over a low heat for about 30 minutes.
In the meantime, clean, wash and finely dice the soup greens and add to the rice about 15 minutes before the end of the cooking time. Clean, wash and cut the mushrooms into thick slices. Heat the fat in a pan. Brown the mushrooms in it, add to the risotto and cook for another 5 minutes.
Coarsely slice the parmesan. Fold 2/3 into the rice. Season to taste with salt and pepper. Place the risotto in a bowl, sprinkle with the remaining Parmesan and serve.