High-quality tea served at the Imperial court is called what?

There isn't a single, universal term for high-quality tea served at the Imperial court. The specific terminology would depend on the specific historical period and imperial court you're referring to.

Here are some possibilities:

China:

* 贡茶 (gòngchá): This literally translates to "tribute tea" and was high-quality tea presented as a tribute to the emperor.

* 龙井 (lóngjǐng): This refers to a specific type of green tea from a famous region in Zhejiang province, considered a premium variety often enjoyed in the imperial court.

* 皇家茶 (huángjiā chá): This means "imperial tea" and is a more general term for tea reserved for the emperor and his court.

Japan:

* 御茶 (gyocha): This translates to "imperial tea" and refers to tea specifically prepared for the emperor.

* 煎茶 (sencha): This is a popular type of green tea in Japan, often served at the Imperial Palace.

Other:

* Court tea: This is a general term for tea served at the royal court, applicable to many historical periods and cultures.

To provide a more precise answer, please specify the historical period and imperial court you are interested in.