Beef Strips with Tomatoes

1 (lb) flank steak

1/3 cup soy sauce

1/3 cup dry white wine

1 tsp sugar

2 tbsp cornstarch

1 medium onion, sliced

2 cups fresh mushrooms, sliced

1/2 green pepper, sliced

1 pint cherry tomatoes

Slice steak very thin, diagonally across grain. Place in 2 quart casserole. Combine soy sauce, wine and sugar. Pour over meat. Mix lightly to coat evenly. Marinate for 1 to 2 hours, in refrigerator, Stir in cornstarch, onion, mushrooms and green pepper. Cook in Radarange, covered on HIGH for 8 to 10 minutes, or until sauce is thickened. Stir halfway through cooking time. Add tomatoes. Pierce skin slightly. Cook in microwave covered, on HIGH for 1 minute or until tomatoes are heated.