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
Spray a frying pan with oil and cook beef over high heat for 3–4 minutes, to your liking. Transfer to a plate to keep warm.
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.
TIP - trim your rump steak well to reduce the fat in your meal. I have added the photo so you can see how I trim mine. It is much easier if you have a boning knife ( I have plenty as I used to be a butcher)