Easy and Elegant Beef Stroganoff
beef sirloin, boneless cut into strips
Sprinkle steak strips with half the pepper.
Melt 1 tablespoon butter in large, preferably nonstick, skillet over med-high heat.
Add sliced mushrooms, whites of scallions and remaining pepper.
Cook, stirring often, until mushrooms are tender, about 8 minutes.
Remove with slotted spoon to bowl.
Add remaining butter and heat over high heat until sizzling.
Add beef strips and stir-fry about 2 minutes until browned.
Stir in gravy and vinegar.
Remove from heat and stir in sour cream until blended.
Sprinkle with green part of scallions.