Umami means “delicious taste” or “pleasant savory taste” in Japanese.
It has always been present in food together with sour, bitter, sweet and salty flavors. However, it was discovered only in 1908 by the University of Tokyo chemist Kikunae Ikeda. He discovered glutamate, an amino acid that is present in some foods and gives them a special flavor. Ikeda learned how to isolate glutamate and patented monosodium glutamate, a well-known flavor enhancer.
Umami has a mild "protein", pleasant, meaty taste and a long aftertaste.
Glutamic acid, which is found in numerous foods, gives it an unexpressed umami taste. But salts from glutamic acid – glutamates – give a more pronounced umami taste. To feel this taste, you need to release them. It is done through heat treatment.
For example, raw meat does not have umami taste, but if cooked, it will appear. Glutamates are also released by fermentation – soy sauce, jerky, and cheese have an umami taste. Mushrooms, green peas, corn and tomatoes contain large amounts of glutamate as well.