From the Wikipedia page https://en.wikipedia.org/wiki/Luk_Yu]
Luk Yu (Chinese: 陸羽茶室) is a tea house and dim sum restaurant located in Stanley Street, in the Central area of Hong Kong, established in 1933.
It is known for its colonial style, adherence to tradition and loyal long-time customers, for whom the entire first floor is unofficially reserved.
The tea house gets its name from the Tang Dynasty poet Lu Yu who wrote The Classic of Tea which describes the history and culture of Chinese tea. (Luk Yu is the Cantonese version of Lu Yu.)
Luk Yu also sells its branded Luk Yu tea bags in local stores and in the UK.