It is very well known that Darjeeling produces very flavourful black teas, yet Oolong teas from Darjeeling are best kept secret. rjeeling Oolong Teas are rare but very widely prized. With the cold weather of the mountains of the Himalayas and with enough sunshine and rain makes the Darjeeling Oolong Tea one of the most famous and most expensive oolong tea around the globe.