Roasted Potato is obtained by cooking an Potato over a fire. It restores 20 health instead of costing 3 health, deducts 5 less Sanity and restores 12.5 more heath than the raw version and takes 6 days to spoil. It has the same uses as raw Potato.
Potatoes are featured in The Gorgeevent in Don't Starve Together. They grow from Fluffy Seeds, which can be bought from Sammy for one Old Coin. A patch of four potatoes can be found already grown in the Swamp Pig village. A potato can be made into a Roast Potato by being cooked at the Campfire next to the Swamp Pig Elder. Potatoes can be used in a variety of Cooking Recipes exclusive to The Gorge.
The Potato was originally exclusive to The Gorge event, but it was later introduced into the main game along with the WarlyCharacter Update.
The "kinship" that WX-78 feel might be a reference to Glados, the robot from portal that turned into a potato battery or the metal potato (and its counterparts(The Thingys)) that is used to travel to a new world.