300 year old fruit preserves found.

Mount Vernon 18th Century Cherries

Several glass bottles filled with perfectly preserved cherries and berries have been unearthed at George Washington's Mount Vernon (Credit: Mount Vernon Ladies’ Association (MVLA)) 

https://www.kcby.com/news/offbeat/gallery/bottles-of-preserved-cherries-unearthed-at-president-george-washingtons-mount-vernon-virginia-18th-century-history-archaeology-scientific-analysis-dmv?photo=1