A perpetual stew, also known as forever soup, hunter’s pot, or hunter’s stew, is a pot into which foodstuffs are placed and cooked, continuously. The pot is never or rarely emptied all the way, and ingredients and liquid are replenished as necessary. Such foods can continue cooking for decades or longer if properly maintained. The concept is often a common element in descriptions of medieval inns.
Foods prepared in a perpetual stew have been described as being flavorful due to the manner in which the ingredients blend together. Various ingredients can be used in a perpetual stew such as root vegetables, tubers (potatoes, yams, etc.), and various meats.
It’s not something you would do at home, more of a restaurant thing.
I do this at home to make stock. It takes me more like 2 months to save enough to make a gallon of stock, and I also save bones. It’s never outstanding (typically too onion-y) but more than serviceable.