You are probably thinking of century eggs, also known as thousand year eggs and many other names. The name isn’t literal; they are made within weeks or months a

You are probably thinking of century eggs, also known as thousand year eggs and many other names. The name isn’t literal; they are made within weeks or months and I seriously doubt they’d remain edible after 1000 years (nor would they be affordable for your average cook). https://en.wikipedia.org/wiki/Century_egg https://en.wikipedia.org/wiki/Century_egg