What makes this tea taste sweet?

I have a sore throat, and a friend recommended Throat Coat tea. It doesn’t seem to have any sweeteners, has zero calories, yet tastes intensely sweet to me. Like as sweet as heavily sugared sweet tea. What’s up with that? Is one of these ingredients naturally sweet, or are my taste buds miswired?

The ingredients:
Organic Licorice Root
Organic Slippery Elm Bark (USP)
Organic Licorice Root Dry Aqueous Extract 6:1
Organic Marshmallow Root (PhEur).
Organic Wild Cherry Bark (Prunus Serotina)
Organic Bitter Fennel Fruit
Organic Saigon Cinnamon Bark
Organic Sweet Orange Peel

Licorice root.

Wow! I had no idea. Thanks.

Be careful, though. Natural licorice can have a laxative effect.