From the different tea gardens I visited in North Thailand, I remember one that produces a coffee Oolong.
the green coffee beans are mixed with the tea leaves at the end of the oolong tea manufacturing process ans roasted during the drying of the fresh leaves.
The result is very interesting. The coffee notes marry beautifully to the floral taste of the oolong tea. Congrats !
This tea may appeal to coffee drinkers looking for ways to switch from coffee without missing it.