I’m not a tea expert, by any means, so I wouldn’t want to point you the wrong way.
Here are a couple photos to whet your appetite (at least in a historical sense. The first is an ale/wine “slipper”, the toe of which is slipped into your hearth’s fire. 
The second is of my mulling iron (which Julia Child called a “Buffalo Iron”) 
I mostly use the iron for quickly bringing blanches back to the boil.
Aloha,
Kaleo
