2To prepare dashi stock, combine 600g cold Water and 10g Kombu in a pot. Heat slowly over medium-low heat. Just before the Water boils, remove the Kombu. Add 15g Katsuobushi to the hot Water, bring to a gentle simmer for 30 seconds, then turn off the heat. Let the Katsuobushi settle for 2 minutes, then strain the dashi stock through a fine-mesh sieve, discarding the Katsuobushi. You will need 360g of dashi stock.