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

2. Remove the plastic wrap and screw top. Lasts for a month in a refrigerator. Keep the konbu soaked in the liquid. You can also enjoy the pickled konbu afterwards.

* 2weeks expiry if you don’t use microwave.
* ”ponzu” is a word used for citrus fruit juice. The word had been transmitted from Holland in Edo-era and have transformed as Japanese.

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.