I love beef stroganoff but stopped eating it because I decided to eat healthy, until I figured out to make a healthy version from scratch rather then use the packet product from the supermarket which has a much higher fat content. Give it ago as see if you can notice the difference
Reduce heat to medium. Add onion, garlic and mushroom. Cook, stirring, for 5 minutes, until soft. Add paprika. Cook, stirring, for 1 minute. Stir in stock, tomato paste and mustard. Return beef to pan. Stir to combine. Bring to the boil, then simmer for 5 minutes, until sauce is thick and beef is cooked through.
Stir in sour cream. Serve beef over pasta and sprinkle with chopped parsley, if desired. Serve with green salad.