1920s Edinburgh childrens song:

I love a sauasage
A Cawperative sausage
You can tell it's Cawperative by the smell
When you fry it with an ingan
You can hear the ingan singin
Mary, ma Scots bluebell.

(tune: Harry Lauder's "Mary My Scots Bluebell"; "ingan" = onion; "Cawperative" = Co-operative, the chain of nonprofit retail outlets for the working classes opened across the UK in the 1860s).