Knuckle sandwich
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The knuckle sandwich originated during the Industrial Revolution as a cheap yet filling luncheon for factory and mill workers in the North of England. It comprises of pickled pig knuckles (or sometimes pig trotters), dripping and white bread. The bread was often in the form of a bread roll which is commonly known as a "cob" or "barm".
The popular English phrase "to knuckle down" is derived from this dish. To knuckle down literally means " to get on with your work" and came from the practise of factory owners asking the workers to put down their sandwiches and continue with their work.