Song Tan felt increasingly that something was odd:
"Wait a minute."
"Grandpa, aren't you guys building a stove?"
Only then did Song Youde smile, "With such large tobacco leaves, how can you bake them on a stove? You can't spread them out."
"I'm building a taller baking room; we'll take it slow, I'm not in a rush, Grandpa."
Darn it, by comparing like that, Song Tan realized, they actually wanted to build a small room two meters tall!
A four-square room tightly sealed, with just an opening at the bottom for burning coal.
Indeed, to ensure the temperature and finesse, they wouldn't even use firewood at the bottom; Song Youde was even planning to haul coal instead.
Coal burns longer and the temperature doesn't fluctuate wildly; it's advantage is its stability.