
This foundational Japanese broth is one of those kitchen staples that transforms everything it touches β from miso soup and noodle dishes to braised vegetables and delicate sauces. The flavor is clean, deeply savory, and subtly oceanic, built entirely from kombu seaweed and bonito flakes steeped with quiet patience rather than a long, laborious simmer. Because the ingredient list is so short and so pure, there's no need to scrutinize labels for hidden additives or worry about flour-based thickeners sneaking in. The technique is all about gentle heat and restraint β the kombu is never boiled, and the katsuobushi is steeped off the heat, which keeps the broth clear and silky rather than bitter or cloudy. Once strained, you're left with a golden liquid that tastes far more complex than its three ingredients suggest. It keeps in the fridge for a few days, so you can make a batch ahead and reach for it all week as a flavor-building base.
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Use kitchen scissors or a knife to score the kombu with a few shallow cuts along its surface, then place it in a medium saucepan with the cold water. Let it soak for 30 minutes, until the kombu has softened and the water has taken on a faint golden tint.
Set the saucepan over medium-low heat and warm the kombu and water slowly, until small bubbles begin to form at the bottom of the pan and the water reaches about 140β150Β°F (60β65Β°C) β just below a simmer. This should take about 10 minutes. Do not let the water boil.
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