What you need:
- 1-2⁄3 cups water
- 1 piece dried konbu, 4 inches in length
What you do:
- The white powder on the surface of dried konbu adds to the flavor, so do not wash before use. Simply wipe with a damp cloth.
- Place the water and konbu in a saucepan and leave to soak for 2 or 3 hours.
- Place the saucepan over medium heat. Just before the water boils, remove the konbu. Use the konbu-flavored water as stock.