Sauté the onions, garlic and bacon in the olive oil over
a low heat until the onions are soft.
Stir in the mushrooms, anchovies and olives, season with salt and pepper
and simmer for 5 minutes.
In the meantime, cook the pasta in salted water until al dente. Drain
and fold into the sauce.
Serve sprinkled with Parmesan cheese.