I think the key ingredient here is definitely the stevia. It just brings all the other flavours together into a special blend that could easily have been pretty forgettable. Not only the natural sweetness of the stevia, but its actual taste works wonderfully with the rest, and especially with the fennel seeds. I’m really happy about this one, I thought it would taste like a hundred other herbal teas, but it does stand out!
(As for the digestive help, I can’t really say much about it, as I’ve never really had problems with digestion, but I’ll trust other reviewers that it does help!)