@Bram – one of the tea store owner in Taiwan told me that brewing with an espresso machine helps connect the ‘tea’ and the ‘drinking,’ to be honest to this date I have a hard time understanding it. Oddly enough, with my recent visit to the World Tea Expo in Japan, I again run into another store owner who is doing the exact same thing.
@Peter – Thanks very much! Perhaps the Bkon is designed for commercial purpose? I am very much interested in trying out the vacuum brewer you mentioned. But I assume it would not work well for Japanese Sencha …