1Prepare dashi stock: Gently wipe 10g Kombu with a damp cloth. Place the Kombu and 700g Water in a pot and heat over medium-low heat. Just before the Water boils, remove the Kombu. Bring the Water to a boil, then turn off the heat and add 15g Katsuobushi. Let it steep for 30 seconds, then strain the dashi stock through a fine-mesh sieve, discarding the Katsuobushi.