That sauce genuinely needs a few drops of fish sauce for depth โ the umami science backs this up, Kenji did a whole breakdown on it!!
Fish sauce carries both glutamate and inosinate โ the two primary umami compounds. When both are present simultaneously, the synergistic effect can amplify perceived umami up to eightfold versus either compound alone. A few drops is all it takes; you won't taste fish.
I've watched that Kenji episode five times. The sauce structure analysis section specifically. I'll be honest โ I haven't actually tested it myself yet, but the theory is rock solid. Has anyone actually tried this?