Semi-related fun fact: The center of a KitKat is partly made of crushed off-cuts of the previous batch of KitKats. Which begs the question… what was the first KitKat made of?
Continuous soup was a pretty common meal in pre industrial times for poorer people as well as cheap taverns. It's just a pot on a low fire that had various meats, vegetables, herbs, water and sauces added whenever it got low. It kind of sounds delicious
If my recollection of internet topics isn't failing me (it probably is), there's a pot of soup in like China or something that has been in continuous use for the last several hundred years.
A batch of pot-au-feu was claimed by one writer to be maintained as a perpetual stew in Perpignan from the 15th century until World War II, when it ran out of ingredients to keep the stew going due to the German occupation.
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Notable examples include beef and goat noodle soup served by Wattana Panich in Bangkok, Thailand, which has been cooking for over 49 years as of 2024, and oden broth from Otafuku in Asakusa, Japan, which has served the same broth daily since 1945.
If I remember right, the ingredient that's made from the previous batch is the filling between the wafers. Without that, they could have just mashed up some wafer and chocolate to get something of the right consistency, but I'd bet they just used chocolate instead.
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