Making Proper Dashi
This is not a broth you boil for hours. It is a quick infusion that relies on the quality of your dried ingredients and strict attention to temperature to keep the flavor clean and free of bitterness.
The clarity of the water is everything.
Avoid boiling the kombu, as this releases slime that clouds the broth and introduces an astringent taste. Keep your heat low and your movements steady.
- medium saucepan
- fine-mesh sieve
- muslin cloth or coffee filter
What goes in.
- 4 cupswater
- 1 piece (4-inch)dried kombu (kelp)
- 1.5 cupskatsuobushi (dried bonito flakes)
The simmer threshold
Remove the kombu just before the water reaches a rolling boil, and never boil the bonito flakes. A gentle steep is all that is required to draw out the smoke and brine.
The method.
Soak the kombu
Place the water and kombu in a saucepan. Let it sit for at least 30 minutes, or longer if you have the time, to rehydrate the kelp.
Heat the base
Place the pan over medium-low heat. Bring the water to the verge of a simmer, watching for small bubbles to form around the edges of the kombu.
Remove the kombu
Lift the kelp out immediately. If you leave it in as the water boils, the broth will turn bitter and murky.
Add the bonito
Bring the water to a brief boil, then turn off the heat completely. Scatter the bonito flakes over the surface and let them sink on their own.
Strain
Once the flakes have settled to the bottom (about 2 minutes), strain the broth through a sieve lined with a cloth. Do not squeeze the flakes, or you will cloud the liquid.
Other turns to take.
Kombu Dashi
Omit the bonito flakes entirely. This is a vegetarian-friendly broth with a clean, deep ocean sweetness, ideal for vegetable nimono.
Niban Dashi
Take the used kombu and bonito flakes from your first batch and simmer them again in 2 cups of fresh water for 10 minutes. This creates a secondary, milder broth.
When it doesn't go to plan.
Wipe the kombu with a damp cloth to remove grit, but leave the white powdery substance on the surface—that is mannite, which carries the flavor.
Store finished dashi in the refrigerator for up to three days or freeze it in ice cube trays for easy portioning.
The quality of your katsuobushi matters. If it looks like gray dust, it will lack the bright, smoky profile of high-grade, thick-shaved flakes.
The ones that keep coming up.
Can I use powdered dashi?
Powdered dashi is a convenient substitute, but it often contains added salt and seasonings. Making it from scratch allows you to control the exact balance of salt in your final dish.
Why did my broth turn cloudy?
Cloudiness usually occurs if the kombu was boiled too long or if the bonito flakes were squeezed during straining. Handle the solids gently.
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