I had to read the title multiple time to finally get it was pie-men. Mayhem was a Victorian social reformer who spend a lot of time writing about ordinary life in that period. This is a part of that collection.
As a book to read, I found it very mundane. There are lengthy descriptions of all the types of pie these men are selling, which carries little entertainment value – for me at least. However, if you were looking for a non-fiction account of the Victorian life, this would be a great place to start.
Of Street Piemen (Little Black Classics #26) – Henry Mayhew