Fry an onion and some garlic gently till soft, season with black pepper and a bit of salt, add mushrooms (finely sliced) and cook. Add tablespoon of tomato puree and a slosh of white wine, and any herbs that you fancy (tarragon goes nicely) and cook for about 10 minutes. You could add some cream as well if you wish.
Cook the mushrooms in butter. Small chopped onions are good too. Garlic. Add arborio rice but ordinary will work if you haven't got any. Pour in chicken stock bit by bit, stirring all the time. I make the children do this bit. When it's ready, add Parmesan. You can include frozen peas as well.