Generally, I'd agree with the process JaneD describes -- wrap in foil and put into wood or charcoal embers. But suggest this term as more directly translating the concept. Plenty of hits (and interesting reading) to find out how this is done in modern equipment (as when a restaurant has 'glödbakat äppel' and their menu.

"Coal Baked Potatoes
An easy way to make baked potatoes is wrap them each in foil (you don't have to do this but then hopefully you don't mind the taste of ash :-)
Anyway, bury them under the coals of your campfire, turn them occasionally and they should be done in about half an hour."
Read more: link below.