Dashi (出汁, だし) is a family of stocks used in Japanese cuisine. Dashi forms the base for miso soup, clear broth soup, noodle broth soup, and many simmering liquids to accentuate the savory flavor known as umami.Dashi is also mixed into flour base of some grilled foods like okonomiyaki and takoyaki.
The most common form of dashi is a simple broth made by heating water containing kombu (edible kelp) and kezurikatsuo (shavings of katsuobushi – preserved, fermented skipjack tuna or bonito) to near-boiling, then straining the resultant liquid; dried anchovies or sardines may be substituted. The element of umami, one of the five basic tastes, is introduced into dashi from the use of katsuobushi and kombu. Katsuobushi is especially high in sodium inosinate and kombu is especially high in glutamic acids; both combined create a synergy of umami.
Granulated or liquid instant dashi largely replaced the homemade product in the second half of the 20th century. Homemade dashi is less popular today, even in Japan. Compared to the taste of homemade dashi, instant dashi tends to have a stronger, less subtle flavor, due to the use of chemical flavor enhancers—glutamates and ribonucleotides.