Heat some olive oil in a heavy based fry pan
Add the onion and soften for about 10 mins until it is soft and sweet.
Skin the sausages and crumble into the pan
Brown the meat by breaking it up with a spoon then add the white wine, and allow this to bubble while you scrape up any burnt sausage.
Allow the wine to reduce by half.
Add the mustard and the cream and simmer for a few minutes.
Check the seasoning
Serve with pasta shapes and sprinkle with cheese if desired.