Wash and scrape the mussels.
Cook the mussels in a shallow pan in the white wine until they open. Save the juice. Remove the empty shell from each mussel and discard. Place the filled shells on a grilling tray.
In another pan melt the butter and add the onions, garlic and parsley and cook for 2 to 3 minutes until soft.
Add the tomato sauce, cream and juices saved from th