Just realised the second link is wrong. It should be https://www.pepysdiary.com/diary/1667/04/20/#fnr1-1667-04-20

If you were puzzled like I was, sparrowgrass = asparagus.

The etymology of asparagus is interesting – many people think that it was called sparrow grass, but the upper class thought it a vulgar term and subtly changed its name to asparagus to make it sound more posh. This is not quite true: it actually began life as asparagus coming from Mediæval Latin, then it was shortened to sparage in Late Old English and then further modified to asperages in Middle English. It was anglicised to sperach or sperage in the 16th century, but strangely it was officially spelled as asparagus to be in line with Latin. The word asparagus became associated with “stiffness and pedantry”, and the “folk-etymologi[s]ed” sparrow grass arose in reaction to these Latin throwbacks. All this information came from the wonderful Online Etymological Dictionary. I love the Old English word – eorðnafela – sounds like some kind of elf queen from a Tolkien book.