Heat the oil in a large frying pan over a medium-high heat. Add the sausage and using a wooden spoon break it up into smaller pieces. Cook 6-8 minutes until golden brown.
Add the mushrooms and cook, stirring occasionally for 5 minutes until softened.
Add the crushed red pepper, fennel seeds, pepper and garlic. Cook, stirring, about 1 minute until fragrant.
Add the vodka, the can of tomatoes with the juice, tomato purée, tomato paste, sugar and salt; stir to combine. Reduce the heat to medium. Cook, uncovered, stirring occasionally for 10 minutes to alcohol to burn off the allow sauce.
Add the cream; stir to combine. Add the cream and stir. Simmer, uncovered for 5 minutes until the sauce has reduced a little. Taste to see if the sauce needs any more seasoning. Stir in the parsley.
While the sauce is cooking, bring a large pot of water to the boil. Add a good pinch of salt and the pasta; stir. Cook, uncovered, for 10 to 12 minutes until al dente. Drain the pasta and add it to the sauce. Serve individual bowls topped with lots of parmesan.