Cook the pasta according to packet instructions, drain and reserve about 100ml cooking liquid. Meanwhile, heat the oil in a large nonstick pan over a medium-high heat, add the onion and fennel and cook for 5 minutes until starting to soften.
Increase the heat and add the sausage and chilli and cook for a further 5 minutes, stirring to break up and so it doesn’t catch, add the reserved pasta cooking water and bubble for a further couple of minutes. Toss through the pasta and serve with Parmesan.
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