Gyokuro refers to a tea that has been cultivated under very special conditions to heighten its quality. Some of the most renowned teas of China come from areas where fog blocks the direct rays of the sun for a period of time during growth. For Gyokuro cultivation, we simulate a similar process. The tea plant is shaded with a fine screen for at least three weeks during the crucial period of growth, just before harvest. Photosynthesis provokes the transformation of Theanine, an amino acid responsible for the Umami flavor, into Catechin, responsible for the astringency of tea. Thus, in limiting photosynthesis for a short period of time, the bitter taste of this tea is heavily muted, and the Umami taste is brought into the foreground. Please see the definition of Umami for more information regarding this important aspect of Japanese tea. (For specific instructions on how best to infuse Gyokuro, click here.)