This is a vegetarian 20 minute meal if you decide to omit the Parmesan cheese. It is your choice. All you need to do is simmer the mushroom and the red onion together. Add a little water, sun-dried tomato sauce, pepper, garlic paste and finish simmering while you pop the fettuccine into a boiling pot of water. 4 minutes my friends for the fettuccine to boil and take it out, drain and toss into your simmering mushrooms and onion sauce. Serve with crusty garlic bread and watch your family smile.