The process by which sencha and other Japanese ryokucha (緑茶, green tea) is created differs from Chinese green teas, which are initially pan-fired. Japanese green tea is first steamed for between 15–20 seconds to prevent oxidization of the leaves. Then, the leaves are rolled, shaped, and dried. This step creates the customary thin cylindrical shape of the tea. Finally, the leaves are sorted and divided into differing quality groups.
The initial steaming step imparts a difference in the flavour between Chinese and Japanese green tea, with Japanese green tea having a more vegetal, almost grassy flavour (some taste seaweed-like). Infusions from sencha and other green teas that are steamed (like most common Japanese green teas) are also greener in colour and slightly more bitter than Chinese-style green teas.
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