While in Korea, I had noticed street vendors hawking potatoes that were baked in an iron tub of hot salt which they were pushing around in their street carts.
Roasting potatoes slow baked in an iron pot filled with simply water softener salt baked in an oven at 250f should give great results of a fluffier potato. I've also heard this done with a $$ Prime Rib roast but that sounds daring..
Does anyone have any experience in baking with just rock salt? I assume that cheap water softener salt would be safe to use as it is extremely cheap and easy to find.