1. Put all the ingredients in a preserving bottle and cover softly with plastic wrap. Microwave on 600W for 30seconds. (15seconds on 1200W)

2. Take out and stir if the salt is remaining. Remove the wrap and screw top. Lasts for a month in a refrigerator.

* Without using microwave, put all the ingredients in a preserving bottle and leave for a day to the onion flavor merge into the seasonings.

For how long you should cook with your microwave oven, see Cooking Time vs Wattage Conversion.
For more tips of using Microwave Oven, see Sachiko's Guideline to Microwave Cooking.