Heat oven to 400°F. Peel the squash and dice into ½ inch pieces. Add to a baking tray and drizzle with olive oil, then season with salt before roasting in the oven for 20-25 mins, until soft (do 15 and check). Remove from the oven and allow to cool.
Fry sausage whilst breaking it up with a spoon, until browned. Then add in the fennel seeds, sage and garlic cooking for another minute. Pour in the cream and simmer until reduced, add parmesan.
Add squash last. then pasta and a big splash of pasta water (if needed) to the sauce.
Serve up in bowls topped with more Parm and a grating of nutmeg, if using.
