A quick Japanese stock made by steeping kombu seaweed and, usually, katsuobushi — dried, fermented and shaved bonito. It is ready in under half an hour and is the base of miso soup, noodle broths and countless simmered dishes.
What it does in a recipe: Clean, glutamate-driven savour that adds depth without adding weight or colour. Pick the swap that covers that job — the ratios below are written so you can act on them without doing any arithmetic.
Also called: Awase dashi, Japanese soup stock
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Quick answer
Kombu dashi (kombu only)
4 cups awase dashi = 4 cups water steeped with a 4-inch piece of kombu
All substitutes, best first
4 ways to replace dashi
Kombu dashi (kombu only)
Reliable
4 cups awase dashi = 4 cups water steeped with a 4-inch piece of kombu
Kombu is the source of dashi's glutamate; the bonito adds inosinate on top, which multiplies the perceived savour. Kombu alone gives you a cleaner, gentler version of the same stock and no fish at all.
MethodSteep the kombu in cold water for a few hours, or heat it slowly and pull it out just before the water boils. Boiling kombu makes the stock slimy and bitter.
Trade-offNoticeably less savoury and without the smoky note bonito gives. This is the vegan and vegetarian dashi, and adding a dried shiitake to the steep brings back much of the missing depth.
Allergen checkThis is the version to use for a fish allergy or a vegetarian table, since it contains no bonito. Check that the kombu was not packed on a line handling dried fish if the allergy is severe.
Shiitake dashi
Reliable
4 cups awase dashi = 4 cups water steeped with 4 to 6 dried shiitake mushrooms
Dried shiitake are rich in guanylate, a savoury nucleotide that works on the palate much as bonito's inosinate does, so it restores the depth that a kombu-only stock lacks.
MethodSoak them in cold water for several hours or overnight, then strain and leave the last of the gritty liquid behind.
Trade-offDistinctly mushroomy and darker in colour, which shows in a pale clear soup.
Allergen checkAlong with kombu dashi, this is the version to reach for when the fish in bonito is the problem, since it contains none. Dried shiitake are sometimes packed alongside dried seafood, so check the bag if the fish allergy is severe — that is a medical matter, not a seasoning one.
Instant dashi granules
Reliable
4 cups dashi = 4 cups hot water + 1 to 2 tsp instant dashi powder
Dried bonito and kombu extract with salt and glutamate added, so it reproduces the flavour profile immediately without any steeping.
Trade-offSaltier and flatter than fresh dashi, with a slightly artificial edge that shows most in a simple clear soup.
CookingSaucesDairy-freeEgg-freeNut-free
Allergen checkInstant dashi is bonito-based and therefore contains fish, and most brands also contain soy and sometimes wheat. It is not vegetarian despite how it is often assumed. Read the packet — kombu-only instant versions exist and are labelled as such.
Light chicken broth + kombu
In a pinch
4 cups dashi = 4 cups light chicken broth steeped 15 minutes with a 3-inch piece of kombu
The kombu contributes the marine glutamate that defines dashi, and the chicken broth carries it, which gets you a workable base for a noodle soup when there is no bonito in the house.
Trade-offHeavier and rounder than dashi's clean, almost transparent savour. Fine in a ramen broth, wrong in a delicate clear soup.
CookingSaucesDairy-freeEgg-freeNut-freeSoy-free
Allergen checkUseful when fish is the allergen, since it contains none — but check the broth carton, which may list wheat, celery or soy. Severe fish allergy is a medical matter and warrants care about shared equipment too.
Worth knowing
Standard dashi is made with dried bonito and is therefore neither vegetarian nor vegan, and it carries the fish allergen. This surprises people constantly, since the finished stock looks like clear vegetable broth. If you need a plant-based version, ask for or make kombu dashi, ideally with shiitake.
Cooking around an allergy? Diet tags here describe the ingredient itself, not any particular brand. Processed products change formulation without notice and shared production lines are common, so read the label on everything you use. A severe allergy is a medical matter — confirm with the manufacturer or your clinician rather than relying on a substitution chart.