Making Proper Dashi at Home
You do not need fancy equipment or hours to build a professional-grade base. The difference between a flat soup and one that lingers on the palate is simply the quality of these two ingredients and your attention to the water temperature.
Respect the simmer
The golden rule is never to boil the kombu, which releases slime, or the bonito, which turns the stock bitter. Keep the heat controlled and watch for the small bubbles.
- medium saucepan
- fine-mesh sieve
- cheesecloth or coffee filter
What goes in.
- 4 cupscold water
- 1 piece (4-inch)kombu (dried kelp)
- 1 cupkatsuobushi (shaved bonito flakes)
Stop before the boil
The moment the water begins to shimmer and small beads of steam appear—just before a rolling boil—remove the kombu. This preserves the clarity of the stock.
The method.
Soak the kombu
Wipe the surface of the kombu with a damp cloth if there is white powder, but do not wash it away. Place it in the water and let it sit for at least 30 minutes, ideally overnight.
Warm the base
Place the pan over medium-low heat. Slowly bring to a near-boil. When you see the water surface tremble and the kombu edges curl, lift it out with tongs and discard.
Infuse the bonito
Increase the heat slightly to reach a gentle simmer, then turn off the stove completely. Add the bonito flakes and let them sit for 2 minutes until they sink to the bottom.
Strain
Line your sieve with cheesecloth or a coffee filter. Pour the liquid through slowly. Do not squeeze the flakes, as this makes the dashi cloudy.
Other turns to take.
Niban Dashi
Simmer the used kombu and bonito flakes in fresh water for 10 minutes to create a secondary, milder stock suitable for everyday miso soup.
Kombu-only Dashi
Skip the bonito for a strictly plant-based base that works well for delicate vegetable preparations.
When it doesn't go to plan.
Look for katsuobushi that is thinly shaved; thick shreds take too long to infuse and can turn sour.
If you are in a rush, a 30-minute soak for the kombu is sufficient, but cold-steeping in the fridge overnight develops more complexity.
Keep leftover dashi in the refrigerator for up to three days, or freeze it in ice cube trays for quick additions to stir-fries.
The ones that keep coming up.
What is that white powder on the kombu?
That is mannitol, a naturally occurring substance that provides the sweetness and depth. Do not scrub it off.
Why did my dashi turn out cloudy?
Cloudiness usually happens if you boil the bonito flakes too vigorously or if you press them through the strainer. Let gravity do the work.
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