Do your characters eat in your story? A lot of readers love to have the recipes. Especially book clubs. When they get together to talk about your book, they also like to prepare foods that are described in the story. In my book Let The Good Times Roll, two young boys squabble over a left piece of blue berry la tart.
To give the reader a more tangible connection to my story, I add pictures and music clips too on my website page for that book.