To make 3 cups, use:
1 piece of kelp (about 5 x 10 cm / 2 x 4 in)
3 ¾ cups water
1 cup dried shaved Bonito flakes

  1. Gently wipe the kelp with a clean, dry cloth, trying to leave as much white powder as possible on the surface. Make a scratch on the surface several times.
  2. Heat the kelp and water in a pot with over medium heat. Remove the kelp just before the water begins to boil.
  3. Add a tablespoon of water to restrain the boiling, then add the bonito flakes and reduce the heat. Let the flakes sink to the bottom of the pot for a few minutes.
  4. Strain the flakes from the Dashi. Keep the kelp and flakes if you are making Niban-Dashi.