#1 Bring a large pot of water to a boil #2 Meanwhile in a large skillet, add olive oil and saute onion for about 5 minutes over medium heat #3 Turn the heat to high, then add mushrooms. Brown for about 5 more minutes #4 Add vodka and reduce completely. Stir in cream and tomato puree, then bring to a simmer. Season with salt, pepper, and red pepper flakes #5 Cook pasta according to packaging directions. Drain and toss with sauce, then stir in cheese and parsley right before serving.