Tablier de sapeur is breaded and fried tripe (specifically the gras-double, the second stomach of the cow), traditionally marinated in white wine and mustard before being coated in breadcrumbs and pan-fried until golden.

The dish takes its name from the leather apron of a sapeur (military engineer), which the breaded tripe resembles in shape and colour. It became a Lyonnais bouchon classic in the 19th century when offal was the working-class protein, and the technique of long marination followed by breadcrumb crust was perfected at the bouchons of the Croix-Rousse silk-weaver quarter. Mariano Aubertin, Lyon mayor 1929-1934, was so fond of the dish that bouchons made it a fixture. Today it carries the Label Bouchons Lyonnais certification.

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