Steak Diane

Directions

1. 1
   Combine margarine and Worcestershire sauce in a large nonstick skillet; place over medium heat until hot.
2. 2
   Add mushrooms and onion; saute until tender.
3. 3
   Place steaks between 2 sheets of heavy-duty plastic wrap; flatten to 1/4-inch thickness, using a meat mallet or rolling pin.
4. 4
   Spread 1 1/2 teaspoons mustard on one side of each steak.
5. 5
   Move mushroom mixture to one side of skillet. Add steaks, mustard side down.
6. 6
   Cook steaks 3 to 4 minutes over medium heat.
7. 7
   Stir mushroom mixture occasionally.
8. 8
   Spread 1 1/2 teaspoons mustard on top side of each steak; turn and cook 3 to 4 minutes on second side of steak or to desired degree of doneness.