In 2-Quart batter bowl, combine flour and oil or margarine. Mix well.
Microwave on High for 9 to 10 minutes or until as dark as desired. (Stir when there are 4 minutes left on the timer, when there are 2 minutes, when there is 1 minute, and when there are 30 seconds left on the timer.
Stir when timer counts to zero. If this is not dark enough for you, continue to microwave on High 30 seconds at a time until of desired darkness.
Add onions, celery, bell pepper, and garlic. Stir well.
Microwave on High for 5 to 6 minutes or until soft but not brown.