5) Turn off heat and stir in Dijon mustard and sour cream. Season with salt and plenty of freshly ground black pepper.
6) Cook egg noodles in salted boiling water according to directions on package. Drain and toss with butter while still hot.
7) To serve, pile the noodles high on a plate, top with Stroganoff sauce and finish with rib slices. Garnish with fresh parsley and green onions.