Brazier
Hibachi
noun
Start a fire in your flower pot to make a brazier. A nice, homemade brazier. It might ruin the aesthetics of your garden, but at least you'll be warm. (Or you might just burn down your house.)
The reading is the vocab reading for 火 and the reading you learned for 鉢, rendaku'd.
私は正座をして、火鉢に手をかざしました。
I sat with my legs bent beneath me and warmed my hands over the brazier.