Cook the spaghetti in salted water until al dente. Dice the meat, season with salt and pepper and fry briefly and keep warm. Chop the mushrooms, onions and spring onions into small pieces.
Heat the butter and fry the bacon with onions and spring onions, add the tomato paste and mushrooms and fry for another 5 minutes. Add the cream cheese and vegetable stock and carefully season with salt and pepper, thyme and nutmeg. Let the vegetables simmer slowly for another 5 minutes.
Finally add the fillet cubes and mix with the spaghetti.