2In a pot, combine 1000g Water and 10g Kombu. Heat gently over medium-low heat. Just before it boils, remove the Kombu. Bring the Water to a boil, then add 15g Katsuobushi. Immediately turn off the heat and let it steep for 30 seconds. Strain the dashi stock through a fine-mesh sieve, discarding the Katsuobushi.