Make This Recipe If…
- You cook Japanese food more than once a week.
- You want to control sodium, or avoid added MSG and flavor enhancers.
- You already keep kombu and katsuobushi in the pantry — there is no incremental ingredient cost.
- You want a cleaner, more aromatic dashi base for everyday miso soup and simmered vegetables.
Skip This Recipe If…
- You cook Japanese food once a month or less. Just buy the box.
- You want the sharpest, most concentrated umami hit. Commercial Hondashi wins that contest by design.
- You do not own a spice grinder or dedicated coffee grinder. A regular blender will not grind katsuobushi properly.
What This Powder Is, And What It Is Not
This is not a clone of bottled Hondashi. Ajinomoto’s product relies on monosodium glutamate and disodium inosinate — isolated flavor compounds — to deliver an immediate, unmistakable umami punch within seconds of dissolving. That punch is what makes it useful in 60-second weeknight miso soup. This recipe cannot reproduce it without those additives, and trying to would defeat the purpose.
What it does produce: a powdered scratch dashi — the same kombu and katsuobushi you would simmer for 20 minutes, dried and ground so it dissolves in 15 seconds. The flavor is rounder, more aromatic, and noticeably less salty. It works for every dashi application except the cases where you specifically want the commercial product’s sharpness, like a quick miso soup at the end of a long day.
Ingredients
- 30 g dried kombu — Hidaka kombu (softer, cleaner flavor) or Rishiri kombu (more aromatic) both work. Avoid the brittle, hyper-thin “ma-kombu” sold for shaving — it grinds unevenly. See kombu types for sourcing.
- 25 g katsuobushi — standard hanakatsuo grade (the wide pink shavings) is correct here. The thicker arabushi blocks must be shaved first.
- 5 g dried shiitake stems — broken into small pieces. The stems most recipes discard contribute a guanosine-monophosphate boost that amplifies the kombu glutamate. Standard dried shiitake from any Japanese or Korean grocer.
- 3 g fine sea salt (optional) — only add if you want to closely match the seasoning of commercial Hondashi. Without it, this powder is genuinely low-sodium.
Method
- Wipe and cut the kombu. Do not rinse it. The white powder on the surface is mannitol, a sugar alcohol that contributes a meaningful fraction of the umami you are trying to capture. Wipe lightly with a barely damp cloth, then cut into 2 cm squares with kitchen scissors.
- Dry everything in a low oven. Spread the kombu squares, katsuobushi flakes, and broken shiitake stems on a parchment-lined baking sheet in three separate zones. Bake at 95°C (200°F) for 30 minutes. The kombu should turn brittle and snap cleanly; the katsuobushi will become almost translucent. Do not exceed 100°C — higher heat burns off the volatile compounds (cis-3-hexenol, methyl mercaptan) that give katsuobushi its characteristic aroma.
- Cool fully on the tray. Fifteen minutes minimum. Warm ingredients release moisture into the grinder, which is the fastest way to ruin the texture. The kombu must be at room temperature and snap-brittle before the next step.
- Grind in two stages. Grind the kombu first for 30–45 seconds in a spice grinder or dedicated coffee grinder, until it forms a fine flake. Tip into a bowl. Grind the katsuobushi and shiitake together for 20 seconds — they break down faster than kombu and need less time. Combine both grinds in the bowl and whisk thoroughly so the colors merge.
- Add salt and final blend (optional). If you want the closer Hondashi match, whisk in 3 g fine sea salt now and pulse the combined mixture in the grinder for 5 more seconds. For the low-sodium version, skip this step entirely.
- Store in glass. Transfer to a clean, dry glass jar with an airtight lid. Plastic absorbs aroma over time; metal can react with the salt. A 4-oz jam jar holds the full batch with room to spare.
How to Use the Finished Powder
Standard ratio: 1.5 tsp per 500 ml of hot water (just below boiling, around 85°C). Stir for 15 seconds and use within 10 minutes — without commercial stabilizers, the brewed dashi clouds slightly as the kombu polysaccharides re-hydrate.
For miso soup: dissolve the powder in hot water, then turn the heat off before whisking in miso paste. Boiling miso destroys its aroma. Two teaspoons of miso per 500 ml is a reasonable starting point — this powder is less salty than Hondashi, so you may want a touch more miso than usual.
For rice: add 1/2 tsp of powder per rice cooker cup of water before cooking. The umami integrates during steaming in a way it cannot from a stovetop addition. Particularly good for onigiri and chirashi sushi base.
As a finishing seasoning: a pinch sprinkled over grilled vegetables, omelet, or steamed greens. The unground commercial product cannot do this — the granules are too harsh on tongue. The fine homemade powder dissolves on contact.
Storage and Shelf Life
Cupboard, airtight glass: 6 months. After that the aromatics fade noticeably — the dashi tastes flat rather than ocean-savory. The powder does not become unsafe; it just stops being interesting.
Refrigerator: 9 months. Use a fully airtight jar (not a screw-top with damaged threads) to prevent it from absorbing fridge odors.
Freezer: 12+ months, but only if you portion into small jars. Every time you take a frozen jar out and back in, condensation forms inside, which clumps the powder. For long-term storage, freeze a small “working jar” in the cupboard and freeze the rest in a single sealed pouch.
Adjacent Pages
- What Is Hondashi — the commercial product, its ingredients, and brands worth buying.
- How to Use Hondashi — ratios, applications, and how to adjust salt when cooking with it.
- How to Make Dashi — the full liquid scratch-dashi method this powder is compressing into a 15-second dissolve.
- What Is Katsuobushi — understanding the bonito flakes that drive most of this recipe’s flavor.
- What Is Kombu — the four common types and which to buy for dashi making.
- Japanese Pantry — where Hondashi (real or homemade) sits in a working Japanese kitchen.
Questions People Ask
Why would I make hondashi at home when the boxed product exists?
Three reasons: control over salt (commercial Hondashi is roughly 45% salt and MSG by weight, this recipe is under 10% salt), cleaner ingredient list (no flavor enhancers, dextrose, or stabilizers), and adjustability (you can shift the kombu-to-katsuobushi ratio for different dishes). The trade-off: it costs about 3× more per serving than store-bought, and it takes 25 minutes plus 30 minutes drying time. If you cook Japanese food once a week or less, buy the box. If you cook it nightly and want to control sodium, this is worth making.
Does this taste exactly like Hondashi?
No, and intentionally so. Commercial Hondashi has a sharper, more concentrated umami punch from added MSG (monosodium glutamate) and disodium inosinate. This homemade version has rounder, more complex flavor — closer to a powdered scratch dashi than to instant. It will not produce the immediate hit of savoriness that Hondashi gives in 5 seconds. You compensate by using slightly more (1.5 tsp per 500 ml instead of 1 tsp), and by accepting a softer, more aromatic profile.
Why dry the ingredients in the oven instead of buying them already dried?
Both kombu and katsuobushi come pre-dried, but they still contain residual moisture (5–10%) that prevents the powder from grinding into a fine, free-flowing form. The 30-minute oven dry at 95°C drops the moisture below 2% — that is what lets the spice grinder produce a true powder rather than a sticky paste. Skip this step and the granules will clump within a week of storage.
Can I use a regular blender instead of a spice grinder?
A high-speed blender (Vitamix, Blendtec) works for the kombu but not for katsuobushi flakes — the flakes are too light and just blow around the jar. Use a spice grinder, dedicated coffee grinder, or a mortar and pestle for katsuobushi. A standard blender will produce uneven texture: chunks of kombu mixed with un-broken katsuobushi.
How do I use this in place of bottled Hondashi?
1.5 teaspoons per 500 ml hot water for general dashi (versus 1 tsp of commercial Hondashi). For miso soup, simmered vegetables, and noodle broth, it substitutes directly — adjust salt and soy sauce upward by about 15% since this version has less added sodium. For a fuller breakdown of ratios and applications, see how to use Hondashi.
What is the difference between this powder and a dashi packet?
A dashi packet (like the Kayanoya teabag-style packets) contains larger pieces of the same ingredients, designed to steep in hot water for 2–3 minutes and then be removed. This recipe produces a fully ground powder that dissolves directly. The packet method preserves more aroma; the powder method is faster and uses less product per cup. They are complementary — packets for clear soup or chawanmushi where aroma matters most, powder for everything else.
How long does this powder keep?
Stored in an airtight glass jar in a cool, dark cupboard: 6 months without noticeable flavor loss. Refrigerated: 9 months. Frozen: a year or more, but moisture from temperature shifts during use accelerates clumping, so freeze only what you will not touch for months. The powder does not spoil in the dangerous sense — it just loses aromatics. If it smells flat rather than ocean-savory, replace it.
Can I add dried shiitake to make a vegetarian version?
Yes — replace the katsuobushi with an equal weight of dried shiitake stems (the woody parts most recipes discard). The flavor profile shifts toward earthy mushroom umami rather than ocean-savory bonito, but the powder works well in vegetarian miso soup, simmered vegetables, and rice dishes. For a more assertive vegetarian umami, use 60% kombu, 40% dried shiitake, and add 5g of dried wakame to the blend.