Dashi (Japanese Sea Stock)

Ingredients
Method
Bring cold water and kombu just to a boil in a large saucepan over high heat. Remove from heat and remove kombu (saving it for pickled Napa cabbage ). Sprinkle katsuo bushi over liquid; let stand 3 minutes and, if necessary, stir to make katsuo bushi sink. Pour through a cheesecloth-lined sieve or a coffee filter into a bowl. Do Ahead: Stock keeps 4 days. Cool, uncovered, before chilling, covered.