This is my first karigane (gyokuro-based kukicha), and it is a very interesting, enjoyable tea. The word ‘tart’ is a perfect descriptor. There’s a bit of the sweetness and strong flavor of gyokuro, but the tartness is one of the main flavors. I don’t think I’ve had any tea like it before, actually.
Regular kukicha (sencha-based leaf twigs), which I very much enjoy, is quite different from this. Though there may be some tartness in kukicha, I seem to remember it being sweeter, with a strong aroma.
Anyway, this is a great tea if you want sencha or gyokuro, but something a little different. It’s enjoyable and hard to mess up (even at hot temps it hasn’t become bitter).