How to Make It
Sprinkle beef tips evenly with salt and pepper and brown in hot oil in a large skillet over medium-high heat; add mushrooms and onions and saute for 3 to 5 minutes or until tender.
Stir tomato paste, broth, and mustard into beef mixture. Cover, reduce heat to low, and cook 1 hour or until beef is tender.
Cook noodles according to package directions; drain.
Combine sherry and flour; stir into beef mixture, and cook, stirring constantly, until thickened. Stir in sour cream. Serve over hot egg noodles; sprinkle with parsley, if desired.