Sauces & Pastes

Dashi

Quick kombu-and-bonito stock that is the umami foundation of miso soup and simmered dishes; steep just below a boil and strain promptly to keep it clean and never bitter.

Dashi is the clear, light stock at the heart of washoku, drawn from kombu (edible kelp) and/or katsuobushi (dried, fermented, smoked bonito flakes) to supply the glutamate and inosinic acid that define Japanese umami. It is not a seasoning in its own right but a neutral building block — a liquid you finish with soy sauce, miso, or mirin depending on the dish. Without dashi behind it, miso soup reads flat, nimono feels dull, and chawanmushi never coheres into a savory custard.

Two extraction principles govern the cook. Kombu is steeped gently below the boil — around 60–65 °C / 140–150 °F — so its glutamate leaches out cleanly, without the bitter tannins and slimy mucilage that a rolling boil would draw from the seaweed. Katsuobushi is steeped only briefly in water that has just come off the heat, for two or three minutes, so the flakes surrender inosinic acid without stewing into a cloudy, fishy liquid. When kombu and katsuobushi are combined into awase dashi, the umami is more than additive: glutamate and inosinate reinforce each other, and the stock tastes rounder and deeper than either base alone.

The first steep is ichiban dashi, the aromatic extraction reserved for clear soups, chawanmushi, and refined nimono. The same kombu and katsuobushi, simmered again in fresh water, give niban dashi — lighter, quieter, and the everyday workhorse for miso soup. Beyond the kombu-and-bonito canon, niboshi (dried sardines) and dried shiitake broaden the palette, while instant granules fill in when time is short.

Measured in: ml
Storage: Refrigerate

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Types & varieties

Ichiban dashi (一番だし)

First extraction from kombu and/or katsuobushi — the most aromatic, used for clear soups, chawanmushi, and refined nimono

Niban dashi (二番だし)

Second extraction from the same kombu and katsuobushi simmered in fresh water; lighter and quieter, used for miso soup and everyday cooking

Kombu dashi

Kombu alone; vegetarian, with a soft, briny sweetness and the foundation of shōjin ryōri

Katsuobushi dashi

Bonito flakes alone; deeper, smokier, more meaty umami

Awase dashi

The everyday default: kombu and katsuobushi together, leveraging glutamate-plus-inosinate synergy

Niboshi dashi / Iriko dashi

Made from dried small sardines; assertive, slightly marine, common in Kansai and Tōkai home cooking

Shiitake dashi

Cold-soaked dried shiitake; rich in guanylate and often combined with kombu for a fuller vegetarian stock

Sakekasu dashi

Sake lees simmered with kombu and katsuobushi; cloudy, gently alcoholic, used in winter hot pots

Why awase dashi tastes more than the sum of its parts

The standard stock is kombu plus katsuobushi, but the reason is not simply 'two ingredients, more flavor.' The two bases contribute different umami nucleotides — kombu gives glutamic acid, katsuobushi gives inosinic acid — and the human palate registers the combination as several times more savory than either alone. This is the same synergy behind Western combinations like Parmesan with anchovy, or tomato with aged cheese: complementary nucleotides stack. Dried shiitake adds guanylate to the picture, which is why a kombu-and-shiitake vegetarian dashi can rival a meat-based one.

Glutamate (kombu) supplies the clean, sea-sweet base
Inosinate (katsuobushi, niboshi) supplies the deeper, meaty note
Guanylate (dried shiitake) amplifies both when added to the pot
Awase dashi at roughly 10 g kombu and 20 g katsuobushi per liter is the textbook balance

Ichiban and niban: getting two stocks from one set of ingredients

A single batch of kombu and katsuobushi is meant to be used twice. The first steep — ichiban dashi — is short and gentle: it pulls the most aromatic, cleanest flavor, and is reserved for dishes where dashi should be obvious, like a clear suimono or a delicate chawanmushi. The second steep — niban dashi — simmers the same kombu and katsuobushi in fresh water for a few minutes, yielding a lighter, more muted stock that is perfectly suited to miso soup and everyday nimono, where it will be blended with other strong seasonings. Throwing the ingredients away after ichiban is one of the most common wastes in a Japanese home kitchen.

Ichiban: cold water to kombu, heat gently, remove at 60–65 °C, add katsuobushi off heat for 2–3 minutes, strain without pressing
Niban: return the same kombu and katsuobushi to a fresh pot of water, bring to a brief simmer for 4–5 minutes, then strain
Use ichiban for clear soups, chawanmushi, refined nimono, and any dish where dashi is a featured flavor
Use niban for miso soup, hot pots, and simmered dishes seasoned with miso or strong soy

Common uses

Miso soup — typically niban dashi, whisked with miso just below the boilClear soup — suimono and osumashi, served in lacquered bowls with garnishesSimmered dishes — nimono for potato, daikon, kabocha, burdock, and fishTempura dipping sauce — tentsuyu, built from dashi, mirin, and soy sauceNoodle broths for udon, soba, and somen — dashi is the base under the tsuyuChawanmushi — the savory custard is essentially seasoned ichiban dashi set with eggTakikomi gohan — seasoned rice cooked directly in dashi instead of plain waterOden — winter hot pot where dashi carries the broth for daikon, eggs, and konnyakuSauces for grilled fish — kabayaki glazes and teriyaki-style reductionsDonburi broths — oyakodon, gyudon, and tendon all ride on a dashi-based sauce

Tips & pitfalls

Wipe kombu with a barely damp cloth and do not rinse it — the white powder on the surface is umami-rich glutamate that you want to keep.
For the cleanest kombu dashi, cold-soak the kombu in the refrigerator for 4–12 hours instead of heating it.
Pull the kombu the instant small bubbles gather at the edges of the pot; boiling it releases bitter tannins and turns the stock slimy.
After removing the kombu, slide the pot off the heat before adding the katsuobushi; let the flakes steep 2–3 minutes without stirring so the liquid stays clear.
Strain the katsuobushi as the flakes begin to sink. Squeezing them through a sieve forces out bitter compounds and clouds the dashi.
For a perfectly clear stock, line a fine-mesh strainer with a coffee filter or a double layer of cheesecloth rather than pressing the solids.
Reuse the spent kombu and katsuobushi to make a lighter niban dashi in fresh water — do not discard them after the first steep.
Season at the end only after tasting; dashi itself is unseasoned and is meant to be built into with soy sauce, mirin, or miso depending on the dish.
If you only have hard tap water, filter it first; calcium and magnesium mute the umami and can make kombu taste chalky.

Nutrition

No USDA FoodData Central match for Dashi yet. We surface a per-100 g profile once a generic whole-food entry is matched and verified.

In the shops

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Good to know

Origin: Japan; kombu-based stock is the oldest, tied to shōjin ryōri (Buddhist temple cooking) from the Asian continent, while katsuobushi-based stock spread widely from the Edo period onward
Primary components: Kombu (edible kelp) and katsuobushi (dried, fermented, smoked bonito flakes); niboshi and dried shiitake are common secondary bases
Umami sources: Glutamate from kombu, inosinic acid from katsuobushi or niboshi, and guanylate from dried shiitake — together they create a synergistic umami greater than any alone
Pronunciation: DAH-shee
Standard ratio: 10 g kombu and 20 g katsuobushi per 1 L water for a balanced awase dashi, yielding roughly 1 L of stock
Steeping temperature: Kombu steeped at 60–65 °C / 140–150 °F; katsuobushi steeped off the heat for 2–3 minutes
Total time: 20–30 minutes for ichiban dashi; cold steeps of 4–12 hours work for kombu alone
Difficulty: Easy
Common forms: Freshly made stock, frozen concentrate, granulated or powdered instant dashi, and liquid concentrate
Water preference: Soft or filtered water gives the cleanest result; very hard water mutes umami and can make kombu feel chalky
Storage: Up to 3 days refrigerated in a sealed container; freezes well for 2–3 weeks

Substitutes

Instant dashi granules (hondashi) — The closest convenient substitute; dissolve about 1 teaspoon per cup of hot water. Faster but flatter in aroma and slightly sweeter than fresh dashi
Dried shiitake soaking liquid — The standard vegetarian substitute; rich in guanylate and works well in place of kombu dashi, though it is more woody than briny
Light anchovy stock — Closest Western analogue; assertive and fishy, so use lightly and balance with a strip of kombu or a bay leaf if possible
Mild vegetable stock — Acceptable as a background for vegetarian dishes but lacks glutamate — fortify with dried shiitake and a small splash of soy if you want true dashi depth
Dried shrimp infusion — A rough stand-in for niboshi dashi; briefly steep about 10 g dried shrimp in 1 L of hot water, then strain