1. Put all the ingredients into a preserving bottle and cover softly with plastic wrap.

2. Microwave on 600W for 1minute. (30seconds on 1200W)

3. Stir if the sugar is remaining.

4. Screw top. Leave the konbu kelp soaked in the liquid. You can also enjoy the pickled konbu afterwards. Lasts for a month in a refrigerator.

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.