Clean the mushrooms and remove just the soiled end of the stem. Set aside.
Combine the remaining ingredients (not the mushrooms) in a 2 quart 2 L) microwave casserole or bowl.
With the microwave on HIGH, cook for 5 to 6 minutes. Remove from the microwave, and cover with a lid or plastic wrap. Allow to rest for 5 minutes.
Stir in the mushrooms. Return to the microwave, uncovered, and cook on MEDIUM for 3 minutes. Stir every 60 seconds.
Chill at least 24 hours before serving. To serve: Remove the mushrooms with a slotted spoon and place them on a bed of parsley or endive.
One Serving: Calories: negligible Carbohydrates: negligible