I’ve used the word “umami” a lot on this blog already — it’s shown up in almost every post about dashi, miso, and koji. So I wanted to actually stop and explain it properly, because it’s one of those words that gets thrown around a lot without people quite knowing what it means. As a pharmacist, this is honestly one of my favorite rabbit holes, because umami isn’t some vague marketing word — it’s a specific, measurable chemical phenomenon with a name, a discovery date, and a Nobel-Prize-adjacent backstory.
Where the Word Actually Comes From
Umami was identified in 1908 by a Japanese chemist named Kikunae Ikeda, who was trying to figure out why kombu dashi tasted so deeply savory in a way that didn’t match any of the four known tastes at the time — sweet, sour, salty, bitter. He isolated the compound responsible: glutamic acid. He named the taste “umami,” combining the Japanese words for “delicious” (umai) and “taste” (mi). For decades, umami wasn’t officially recognized as a distinct taste outside Japan — it took until the late 1990s and early 2000s for scientists to actually identify dedicated umami taste receptors on the tongue, which is what finally confirmed Ikeda had been right all along.
The Main Umami Compounds (And What Contains Them)
Umami isn’t one single chemical — it’s a small family of related compounds, and different foods are rich in different ones:
- Glutamic acid (glutamate) — the original umami compound Ikeda discovered. Found richly in kombu, ripe tomatoes, parmesan cheese, soy sauce, and miso. This is also the naturally occurring compound that MSG (monosodium glutamate) is a purified, synthesized version of — which is part of why MSG tastes savory in the first place; it’s essentially isolated umami.
- Inosinic acid (inosinate) — found in katsuobushi, meat, and chicken. This is the compound behind that deep, almost smoky savoriness in a good bonito dashi.
- Guanylic acid (guanylate) — found richly in dried shiitake mushrooms and other dried mushrooms. Drying actually concentrates this compound significantly, which is part of why dried shiitake taste so much more intensely savory than fresh ones.
- Succinic acid — found in shellfish and some fermented foods, including sake lees. It has a slightly different, more briny-savory character than the other three.
Why Combining Them Matters So Much
Here’s the part that actually changes how you cook, not just how you think about flavor: these compounds don’t just add together — they multiply each other. Glutamic acid paired with inosinic acid (kombu plus katsuobushi, which is exactly what awase dashi is) creates a savory intensity that’s dramatically stronger than either compound alone, not just the sum of the two. This synergy effect is well-documented and is the actual chemical reason awase dashi tastes so much richer than kombu dashi by itself.
This is also why so many classic Japanese pairings exist: kombu (glutamate) with katsuobushi (inosinate) in dashi, or dried shiitake (guanylate) added to a kombu-based vegetarian broth for the same multiplying effect. It’s not just tradition for tradition’s sake — it’s actual food chemistry that Japanese cooks figured out through trial and error, centuries before anyone had a name for why it worked.
How to Use This When You Cook
Once you understand the synergy principle, a few classic pairings suddenly make a lot more sense:
Tomato + kombu. Tomatoes are naturally rich in glutamic acid — the exact same compound found in kombu. So when you drop a piece of kombu into a simmering tomato sauce, you’re not adding a new flavor, you’re stacking more of the same umami compound the tomatoes already have, which makes the whole sauce taste rounder and more savory without tasting “fishy” or “Japanese” at all.
Dried mushrooms + meat. Dried shiitake (and other dried mushrooms) are rich in guanylic acid, while meat is rich in inosinic acid. Those are two different umami compounds, and — just like glutamic acid plus inosinic acid in awase dashi — combining different types of umami compounds multiplies the effect rather than just adding to it. That’s the actual chemistry behind why a beef stew with dried mushrooms tastes so much deeper than either ingredient would on its own.
Meat + soy sauce. Meat is rich in inosinic acid; soy sauce is rich in glutamic acid (it’s fermented from soybeans using koji, the same source of glutamate as miso). Splash soy sauce into a Western dish that already has meat in it — a steak, a stew, a pan sauce — and you’re pairing two different umami compounds again, boosting overall savoriness without making the dish taste distinctly Japanese.
The pattern across all three: look for one ingredient rich in glutamic acid and pair it with one rich in inosinic or guanylic acid. That mismatch — not a matching flavor — is what creates the multiplying effect.
A Quick Clarification on MSG
Since I mentioned it above: MSG has an undeserved bad reputation in a lot of Western food culture, largely traced back to unverified claims from decades ago that have since been repeatedly investigated and not supported by good evidence. Chemically, it’s the same glutamate your body already produces and that’s naturally present in tomatoes, cheese, and kombu — just in a purified, standalone form. That said, if you personally notice you’re sensitive to it, that’s worth listening to and working around, the same as with any ingredient.
Understanding the chemistry doesn’t take anything away from the tradition, either. If anything, it makes it more impressive — generations of cooks in Japan (and plenty of other food cultures) figured out how to layer these compounds for maximum flavor long before anyone could explain why it worked at a molecular level. The science just gives us the vocabulary to describe what good cooks have always known instinctively.
日本語要約
「旨味」は1908年、化学者の池田菊苗博士が昆布出汁の深い味わいの正体を突き止めたことで発見された、甘味・酸味・塩味・苦味に次ぐ第5の基本味です。旨味には主に4つの成分があり、それぞれ異なる食品に豊富に含まれています。グルタミン酸(昆布、トマト、パルメザンチーズ、醤油、味噌)、イノシン酸(鰹節、肉類)、グアニル酸(乾燥椎茸などの乾燥キノコ類)、コハク酸(貝類、酒粕などの発酵食品)です。これらは単純に足し算されるのではなく、組み合わせることで相乗的に旨味が増す性質があり、これが昆布と鰹節を組み合わせた合わせ出汁が単体よりもずっと美味しく感じられる化学的な理由です。この原理は和食に限らず、トマトソースに昆布を加える、乾燥キノコと肉のだしを組み合わせるなど、あらゆる料理に応用できます。
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