Here is an unusual pickled item that doesn't really need any explanation other than its name.
3. Peanuts pickled in apple vinegar with yellow chilis.
I recently found these in a supermarket. I didn't make note of the Chinese name and don't want to guess. If I see them again, I'll take down their details and edit this.
Anyway, they were surprisingly good, but so is anything with chilis, in my book.