Family Tested & Approved
beef sirloin, boneless cut into strips
unbleached all-purpose flour
Stir oil and meat in 2 quart casserole until beef is coated.
Cover and microwave on high (100%)) until meat is no longer pink, 4 1/2 to 5 minutes.
Remove meat from casserole; reserve meat and juices.
Add mushrooms and onion to meat juices. Cover and microwave until mushrooms are tender, 5 to 6 minutes.
Shake water and flour in tightly covered jar; stir into mushrooms.
Sprinkle with dry mustard, salt and pepper.
Microwave uncovered to boiling, 30 seconds.
Boil until thickened, 1 minute.
Stir in reserved meat, then sour cream.
Microwave uncovered until hot, about 1 minute.
Serve over hot cooked rice or hot cooked noodles.