The first time I even had Soba tea, I had been in Japan for only a few days so far, and was sitting in a small parlor at a government center in Japan, and was served this as I waited. It tasted like cheerios in a cup, and is so delicious. It took me a long time to find out the english translation – buckwheat tea.
I highly recommend trying it – you may find it at a Japanese or Korean grocer.
Each teabag is designed for 1 pot of tea; 200cc of water for 2 small cups of tea. Let it cool a bit after poring/removing tea bag. Served hot or chilled with no sweetner or milk.