What is the setting of book title sinigang?

There is no widely known book titled "Sinigang." It's possible you're thinking of a book that is:

* Not yet published: It could be a manuscript or a work-in-progress.

* Less popular: There might be a book with that title that is not well-known or widely read.

* Misremembered: You might be thinking of a different title or author.

"Sinigang" is a Filipino soup dish that is well-known, but it is not a common title for a book.

If you can provide more information about the book, such as the author, genre, or a brief plot summary, I might be able to help you find the setting.