In rural Ireland, it’s not unusual for residents to come across a block of bog butter while digging up peat to heat their homes. Incredibly, this butter has often laid buried—in wooden containers, earthenware pots, or animal skins—for hundreds of years. Even after all this time, it can still have a notably buttery texture and aroma, although the taste tends to be a little too aged for modern palates. https://www.atlasobscura.com/foods/bog-butter-ireland-scotland