や? Is the character correcting himself?
1 Answer
It's enumeration.
店にはりんごやきゅうり、たまごなどが置いてあった。
At the store, I saw apples, cucumbers, and eggs and such.
You could use it to join all items, like
りんごやきゅうりやたまご
...and that would still be grammatically correct, but personally, I prefer using や on joining the first two items only. Just my style, just like how some prefer oxford commas and some don't.