Marshmallow root has been steeped as a soothing drink for a very long time — Ancient Egyptians reached for it on sore throats and inflammation, the Greeks and Romans leaned on it for digestion, and it stayed in use through the Middle Ages. The plant itself, Althaea officinalis, grows across Europe, Western Asia and Northern Africa, and its roots are harvested in autumn when they're richest in the compounds that make the tea what it is. One odd bit of trivia: marshmallow confections started out being made from this same root before the recipe drifted away from the plant entirely.
In the cup it's gentle and earthy, with a soft sweetness and floral notes that come through alongside honey, lemon, and a faint medicinal edge — smooth rather than sharp, closer to a mild chamomile than anything bracing. It's naturally caffeine-free, so it suits any time of day, including right before bed.
The mucilage in the root is what gives it that coating, soothing quality, and it has long been drunk for throat irritation, coughs, and general digestive comfort. Some also use it topically for skin irritation, though that's a traditional use rather than a proven one.
To brew it, add dried root to 250ml of just-boiled water and let it steep for around 12 minutes — longer than a standard herbal infusion, since the root needs time to release its mucilage. Strain well before drinking, and add honey or a squeeze of lemon if you want it sweeter.