This is the story that begins everything. My younger brother, Satrio, is a fan of gurih cuisine. He wanted me to fry some tempeh with gurih flavour. I tried the fast and simple recipe, add the batter with ground garlic (1 clove) and coriander seeds (1 tsp), and add a half of sachet broth (Royco), that included some of MSG (monosodium glutamat, the infamous umami starter-potion). The result? My brother just said what I most avoid to face, "Sis, this is so....eneg (the Indonesian word for "taste too much in savoriness") My brother was Ok with that, but he questioned my ability to make another fantastic batter for fried tempeh. Few weeks later, my mother made unbattered fried tempeh (only tempeh, without the batter outside), with the combination of salt and sugar, the secret ingredients of all gurih cuisine. And she did it. My brother liked it a lot and told me that the tempeh was better than any fried tempeh he had before. So basically, the two words don't taste the same. But why it isn't the same has been debate for years. Even professional chefs like to confuse these two tastes.
Gurih : The Layered-Salty and Sweet
I have just browsed about why salt and sugar taste so delicious when they're together (even better than apple and cinnamon, I guess). This is what have been written inside the site :
We like sweet because it signals calories, or energy, to us. And we like salt because we need it for normal bodily function. We have no sodium storage system, as we do with other minerals (i.e. we store calcium in our bones), so Mother Nature's solution is a built-in craving for it. The combination of these two positive biological responses is VERY pleasurable. To use an analogy, it's akin to hearing beautiful music while sniffing rose petals: two positive sensory stimuli.
maybe I can make the formula :
NaCl (small amount) + sugar (various) = gurih
Umami : The Infamous Savoriness
This is the picture of mononatrium glutamat or MSG, the ultimate source of umami.
So let's compare with the catalysator of umami. This is what I found on wikipedia
Umami represents the taste of the amino acid L-glutamate and 5’-ribonucleotides such as guanosine monophosphate (GMP) and inosine monophosphate (IMP).[9] It can be described as a pleasant "brothy" or "meaty" taste with a long lasting, mouthwatering and coating sensation over the tongue. The sensation of umami is due to the detection of the carboxylate anion of glutamate in specialized receptor cells present on the human and other animal tongues.[10] [11] Its effect is to balance taste and round out the overall flavor of a dish. Umami enhances the palatability of a wide variety of foods.[12] Glutamate in acid form (glutamic acid) imparts little umami taste, whereas the salts of glutamic acid, known as glutamates, can easily ionize and give the characteristic umami taste. GMP and IMP amplify the taste intensity of glutamate.[11][13]
so basically the formula of umami is amino acid L-glutamate. See the difference?



