The Angel's Burtchers one: never heard of the book. I got it purely by googling ham and the grain beneath it (which I'd have considered wheat if I hadn't have been pushed in the American sandwich direction).
Anyway book seems like it's based in Los Angeles. This I'm guessing is why its Angel's Butchers.
Having looked up the book now I've no interest in reading in, despite all my friends who have read it appear to have loved it (as seen on goodreads).