Umami (うま味) is the savoury fifth basic taste, alongside sweet, salty, sour and bitter. It comes from glutamate (an amino acid, richest in kombu) and two nucleotides, inosinate (from katsuobushi) and guanylate (from dried shiitake). Combine a glutamate source with a nucleotide source and the savouriness multiplies, which is the whole secret of dashi.
This is our guide to umami, written for chefs and curious cooks: what it is, the three compounds behind it, the synergy that makes dashi work, where it was discovered, and how to build it in the kitchen. It is the concept hub of our Dashi and Umami Masterclass.
The Fifth Basic Taste
Umami (うま味) is the savoury fifth basic taste. Like sweetness, saltiness, sourness and bitterness, it is a taste in its own right, one that supports deliciousness, drawing out an ingredient's character and adding depth to a dish. It is a brothy, mouth-filling savouriness, and it is driven by specific compounds, glutamate and certain nucleotides, rather than by salt.
Umami has its own biology. Taste cells carry dedicated receptors for umami substances, and the stomach has glutamate receptors too, which signal the brain and help trigger protein digestion. Three things set the sensation apart: it spreads across the whole tongue rather than concentrating at the tip, it lingers for several minutes after the food is gone, and it makes the mouth water. For a chef, that lingering, mouth-filling quality is exactly why an umami-rich dish tastes more satisfying.
This guide is the concept hub for the dashi and umami cluster: the science and the synergy principle live here, and the ingredient detail lives in the guides it points to, kombu, katsuobushi, soy sauce and miso.
Source: NRIB SAKE BOOK (umami as one of the five basic tastes) and the Umami Information Center (taste-receptor biology, how the sensation behaves), grade B; facts extracted and reworded.
The Three Umami Compounds
Umami is produced by one amino acid and two nucleotides, and knowing where each lives is the key to building flavour. Glutamate is the everyday umami of kombu, tomatoes and aged cheese; inosinate is the umami of katsuobushi, meat and fish; guanylate is the umami of dried shiitake. Each is savoury alone, but the magic is in combining them.
| Compound | Japanese | Type | Richest sources |
|---|---|---|---|
| Glutamate (L-glutamic acid) | グルタミン酸 | Amino acid | Kombu, tomatoes, aged cheese, cured ham, vegetables |
| Inosinate (IMP) | イノシン酸 | Nucleotide | Katsuobushi (bonito), meat, fish |
| Guanylate (GMP) | グアニル酸 | Nucleotide | Dried shiitake |
Glutamate is the dominant umami compound in kombu, one of the richest natural umami sources; inosinate is what gives katsuobushi its savoury punch (and a bonito's freshness sets how much it carries); and guanylate is concentrated in dried shiitake. For the full ingredient detail, see our guides to kombu and bonito flakes.
Source: the Umami Information Center (the compounds and their sources, guanylate in shiitake), Marutomo (inosinic acid in katsuobushi) and the Hachinohe Shouten kombu brochure (kombu as a rich umami source); grade A/B, facts extracted and reworded.
Umami Synergy: Why Dashi Works
This is the single most useful fact in Japanese cooking: glutamate's umami is dramatically amplified by a nucleotide. Combine glutamate and inosinate at a one-to-one ratio and the perceived umami reaches seven to eight times the intensity of either compound alone. It is not addition, it is multiplication.
That synergy is exactly why Japanese dashi pairs kombu (glutamate) with katsuobushi (inosinate) to make ichiban dashi, the foundational stock. An analysis of ichiban dashi from a venerable Japanese restaurant found its glutamate-to-inosinate ratio to be almost exactly one-to-one, evidence that top kitchens have applied this principle by taste for centuries. The same effect is why a glutamate-rich seasoning (soy, miso, tomato) comes alive next to a nucleotide source (bonito, meat, mushroom).
For a chef, the takeaway is the highest-leverage move in the kitchen: to deepen a dish, pair a glutamate source with a nucleotide source rather than reaching for more salt.
Source: Umami Information Center (the synergy effect, the 7 to 8 times figure at a 1:1 ratio, the ichiban dashi analysis), grade B; facts extracted and reworded.
Popular Products
The three umami compounds, plus a dashi that combines two of them, so you can taste the synergy:
Kōmi Classic Kombu (Dried Kelp), 1kg
Glutamate, the everyday umami compound, at its richest. Kombu is one of the strongest natural sources of glutamate and the glutamate half of a classic dashi. Steep it for a clean, savoury base.
Marutomo Katsuo Dashi Powder, 1kg
Inosinate, the nucleotide umami of katsuobushi (bonito). The savoury counterpart to kombu's glutamate, and the partner that triggers umami synergy. A fast, pure bonito hit in the catering pack.
Who Discovered Umami?
Umami was discovered and named in Japan, and the story runs through three scientists. In 1907 the chemist Kikunae Ikeda began studying what made kombu dashi so savoury; in 1908 he identified glutamate as the source, coined the word "umami" and published the paper naming it the fifth basic taste. His successors then found the other two compounds.
| Year | Who | What |
|---|---|---|
| 1908 | Kikunae Ikeda | Identifies glutamate as the umami of kombu; coins "umami" and names it the fifth basic taste |
| 1913 | Shintaro Kodama | Identifies inosinate as the umami compound in katsuobushi |
| 1957 | Akira Kuninaka | Identifies guanylate, and confirms it as the umami of dried shiitake |
Those three discoveries map exactly onto the Japanese pantry: kombu, katsuobushi and shiitake, the three pillars of vegetarian and classic dashi.
Source: Umami Information Center (the discovery history and dates), grade B; facts extracted and reworded.
How Chefs Build Umami
Umami is built in the kitchen mainly through dashi, the stock that acts as its delivery system: kombu brings glutamate, katsuobushi brings inosinate, and together they give a savoury base far greater than either alone. From there a chef layers more umami through glutamate-rich seasonings, soy sauce, miso and tomato, and nucleotide-rich ingredients, dried mushrooms, cured fish and meat. Pairing the two families is the move.
Fermentation and ageing also build umami, by freeing glutamate over time: it rises roughly fiftyfold as cured ham ages, climbs the longer a cheese is matured, and is the savoury heart of miso and soy sauce. That is why a long-aged ingredient tastes so deep. The practical lesson is simple: umami is why a pinch of kombu or a splash of soy makes a dish taste fuller and rounder without more salt, and pairing a glutamate source with a nucleotide source is the single highest-leverage move for depth of flavour.
Source: Umami Information Center (the ageing and fermentation facts) and the kombu and katsuobushi records for the dashi pairing; grade A/B, facts extracted and reworded. Specific kitchen ratios beyond the 1:1 dashi principle are our own practice.
Frequently Asked Questions
What is umami?
Umami is the savoury fifth basic taste, alongside sweet, salty, sour and bitter. It is a brothy, mouth-filling savouriness driven by glutamate (an amino acid) and certain nucleotides (inosinate and guanylate), not by salt. It spreads across the whole tongue and lingers, which is why umami-rich food tastes deep and satisfying. It was identified and named in Japan in 1908.
What foods are high in umami?
The richest sources split by compound: glutamate is high in kombu, tomatoes, aged cheese and cured ham; inosinate in katsuobushi (bonito), meat and fish; and guanylate in dried shiitake. Fermented and aged foods like soy sauce, miso and Parmesan are especially umami-rich, because ageing frees more glutamate over time.
What is umami synergy?
Umami synergy is the proven effect that combining a glutamate source with a nucleotide source multiplies the savouriness far beyond the sum. At a one-to-one ratio of glutamate to inosinate, perceived umami reaches seven to eight times that of either alone. It is exactly why Japanese dashi pairs kombu (glutamate) with katsuobushi (inosinate).
Is umami the same as MSG?
They are closely related. MSG (monosodium glutamate) is a purified salt of glutamate, the same compound that gives kombu, tomatoes and cheese their umami. So MSG delivers umami directly, while natural foods deliver the same glutamate alongside their other flavours. Umami is the taste; glutamate is the compound; MSG is one concentrated source of it.
How do you add umami without salt?
Lean on umami-rich ingredients rather than the salt cellar: make or add a kombu and katsuobushi dashi, fold in soy sauce or miso, or use tomatoes, dried mushrooms and aged cheese. Crucially, pair a glutamate source with a nucleotide source (for example kombu with bonito, or tomato with mushroom) to trigger the synergy that deepens flavour without extra salt.
Where to Buy Umami Ingredients in the UK
If you are looking to build umami in your cooking, we keep the core ingredients with fast delivery across the UK: kombu and katsuobushi for classic dashi, dried shiitake for a vegan umami stock, and the soy and miso to layer on top. Start with a kombu and a bonito and make a dashi.
For more, browse the Dashi and Umami Masterclass, or read about kombu, bonito flakes, soy sauce and miso, the great umami ingredients of the Japanese kitchen.
Technical data sourced from the Umami Information Center (umami synergy, the three compounds, the discovery history, taste-receptor biology and the ageing facts) and NRIB's SAKE BOOK (umami as a basic taste), with the inosinic-acid fact from Marutomo and the kombu-umami claim from the Hachinohe Shouten brochure. The umami concept was identified and named by Kikunae Ikeda in 1908. Published science is fact-extracted and reworded, not reproduced.
