Umami
"umami" (tastiness)
旨味、うまみ
Umami ("pleasant, savory taste") is one of the five basic tastes (together with sweetness, sourness, bitterness, and saltiness). The term was devised by Professor Ikeda Kikunae of Tokyo University, who in 1908 identified glutamic acid (glutamate) as the component responsible for the tastiness of dashi stock made with konbu-kelp. As this fifth taste was first recognized in Japan and there was no word for it in other languages, the Japanese term UMAMI has come into general use.
[Prof. Ikeda Kikunae]
[Katsuobushi and kelp. two important umami ingredients]
People taste umami through receptors in taste buds specific to glutamate. Umami of course not only occurs in Japanese food - in fact, all humans first come across this taste in breast milk! In larger or smaller amounts, umami is present in fish, shellfish, cured meat, mushrooms, vegetables as ripe tomatoes, Chinese cabbage, spinach, celery, etc., and fermented and aged products involving bacterial or yeast cultures, such as cheeses and soy sauce. Rice also contains umami and umami is an important characteristic of sake as well.
[Shiitake, another umami ingredient]
By the way, nowadays umami components can also be artificially produced according to the methods of the fermentation industry. It was in fact Prof. Ikeda Kikunae who already in 1909 developed a process for mass-producing monosodium glutamate or MSG (he called it "Ajinomoto," "the basis of taste," and this is now the name of one of the largest food companies in Japan). In that case we speak about “flavor enhancers.” During the production of flavor enhancers, guanylic acid and inosinic acid are added to monosodium glutamate, making this another example of the synergistic umami effect.
Japanese Food Dictionary