Flour the chopped beef with flour. Fry briefly in a little oil and place on a plate.
Put the onions and tomato paste in the same pan and fry for a few minutes. Add the mushrooms and garlic and deglaze with the red wine. Let the red wine boil down a little. Add the beef broth and cook on a low fire for 10 minutes.
In the meantime, cook the tagliatelle in plenty of salted water according to the instructions on the packet until al dente.
Add the meat to the sauce and season with salt, pepper and chilli to taste. Just before serving, add the cream and mix with the tagliatelle. If necessary, add a little more water from the pasta.