Tea colour of black tea in Chines is red: Hong Cha. So actual colour of tea wont help. And there are differences in local terms and in mainland vs Taiwan terms. Also simplified Chinese has thrown a whole new spanner in the works. But...
That phrase is what came up in searches when we looked for Taiwan sources of keyboards with brown switches, such as my I-rocks 6230 and the ducky 1087. I am 97% sure its brown switch.