Glutamic acid was found to be the important substance for umami taste and has been used for savory seasonings around the world, although its taste is masked by flavors from fat or herbs. Oven drying at 60 °C increased glutamic acid composition in overripe tempeh powder (S60 15.9 %) and fresh tempeh powder (F60 14.5 %) compared to the freeze–drying method and its original tempeh cake (Table 4). The existence of glutamic acid as dominating amino acid in overripe tempeh powder indicates its potencies of the oven– dried tempeh powder as fermented soybean seasoning.